The Osaki OS-4000LS Massage Chair Review

The Osaki OS-4000LS massage chair is jam-packed with various features and customisation options, hence why it is a popular choice for those looking to invest in a decent massage chair. It's new and innovative with features that should potentially allow for the best massage experience possible, however, before we can really make a firm decision on this particular model, we'll need to look more closely at the chair's features, to be able to decide if this chair indeed makes for a good investment.

This review should hopefully allow you to make an informed decision on whether or not the Osaki OS-4000LS is the best purchase for you. We will explore what makes this product stand out from the rest, such as its adjustable shoulder widths, heat therapy function, 6 different automatic programs or 4 massage techniques, all of which aim to create a massage experience of comfort and pleasure.

This review will contain a lot of information, so if you'd prefer to bookmark this page and come back later (if you're in a rush), you can click the button below to view the full product details and current pricing on Amazon:

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Quick Glance Main Features
Below is the main feature list for The Osaki OS-4000LS. Feel free to click on any of the features listed below to get more details:


The Osaki OS-4000LS's Basic Product Specs
Here's an overview of the basic specs for this model:

  • Full Product Name: Osaki OS-4000LS
  • Model No: OS-4000LS
  • Rated Power Voltage: 110-120V
  • Power Frequency: 50/60 Hz
  • Rated Power Consumption: 200W Max
  • Packaged Dimensions: 55″L x 32″W x 40″H inches
  • Shipping Weight: 350 pounds (or 158.76kg)
  • Height Range: 5'1″- 6'4″ or 1.55m to 1.93m
  • Recommended Weight Limits: 285lbs or 129.27kg
  • Upholstery: Synthetic Leather
  • Warranty: 3 Year Limited Warranty
  • Delivery: Standard Curbside Delivery, White Glove Service
  • Colours: Black, Brown, Ivory
  • Manual: Click here for PDF version
Model Pros Vs Cons


  • Offers Versatile Effective Massage Features
  • 6 Preset Unique Automatic Programs
  • Relatively Affordable In Comparison To Other Models On The Market With Similar Features
  • Extensive Warranty – 3/4/5 years
  • Easy Installation/Assembly
  • Many Combinations And Remote Control Options


  • Only 3 Colour Schemes
  • Does Not Cater For People Shorter Than 5'3
  • Levels Of Strength And Intensity Differ For Customers
  • Varying Customer Service Experiences
  • Controls May Be Complicated For New Buyers

A Closer Look At The Osaki OS-4000LS's Main Features
L-track rollers

This unique feature of the Osaki-OS 4000LS uses a 42″ extended track roller system to reach from the neck to the lower back and into the seat to massage the glutes. The regular OS-4000 models have a standard S-track system which does not reach the seat, whereas this improved model has been created as an advancement on the standard models, with extra functionality and the ability to provide a more extensive and versatile massage experience.

The chair's new L-track rollers will apply a glute massage, which is a huge positive for anyone with lower back pain, hip pain or other discomforts within the lower region. This massage experience will therefore be much more far-reaching and beneficial for the user where all areas of the body can be accounted for. Also with the addition of this feature, tricky areas such as our thighs or glutes will be directly targeted, allowing you to experience a more powerful and relaxing massage.

Zero Gravity Position

The Zero-Gravity position is a common feature among the best massage chairs, and the Osaki OS-4000LS is no exception. It basically works by raising the user's legs and then reclining them at a particular angle, scientifically proven to grant benefits such as pain relief and compression reduction (especially of the spine). To put it simply, this feature helps to take all the weight off your spine and experience a feeling that could be described as “taking off all the pressure”, which will help you to deeply relax and get the most from your massage chair sessions.

Space Saving Technology

This convenient feature basically means the chair will need less space to be fully reclined. It's extremely efficient if you don't want your massage chair to take up a huge portion of your living space, where instead of other massage chair models (such as the Osaki OS-4000/OS-4000T) needing about 18″ of space behind in order for the chair to go into a full recline, this model only needs less than 4″ (that's a huge difference in space requirement). If you have limited space or generally don't want a massage chair to take over the whole room, then this feature will greatly appeal to your needs.

Adjustable Shoulder Airbags

This uncommon feature is a great addition to massage chair models as the Osaki OS-4000LS where it resolves the issue of shoulder airbags being too narrow or uncomfortable for some users. Adjustable shoulders airbags will obviously allow you to adjust the width to suit your shoulder width so it's as comfortable as possible for you. This will most likely be a helpful feature for those with broader shoulders, or for cases when several different users are using the chair in rotation. This feature will ensure that you aren't stuck with a shoulder position that's not suitable to your body type, and once again is a great feature of the 4000 LS, making it more customizeable and worth the extra investment.

Foot Rollers/Footrest Extensions

Foot rollers are a new feature of the OS-4000 massage chair series where the footrest now includes reflexology foot massage rollers which apply a kneading style type massage to the feet's soles, and this allows users to truly experience a head to toe massage experience. The footrest extension therefore extends to a length which greatly addresses the feet, and applies several massage techniques at once to ensure the user's feet are massaged in multiple areas such as the soles, toes and other bones within your feet.

Lumbar Heat Therapy

With the usage of two heating pads in the lumbar section of the backrest, the Osaki OS-4000LS massage chair applies a pleasant heat therapy massage to your lower back's larger muscle groups. This heat will help loosen up tension and ensure maximum relaxation and pain relief in the lower back area with your massage. Heating is a crucial feature for every decent massage chair, really adding to the quality of your massage experience, and making you feel relaxed and relieved as the tension is gradually dissolved.

Feedback From Customers Who Bought The Osaki OS-4000LS

When taking into account multiple websites where customers bought and reviewed the Osaki OS-4000LS massage chair, there was a general consensus amongst buyers that it is a good product with unique features, but that it does have certain flaws. At the time of writing, there were a total of 62 reviews, of which 69% of reviewers rated the Osaki OS-4000LS 5/5 and another 10% rated the massage chair 4/5. In total 79% of customers who bought the product liked or loved it, whether it be for the chair's adjustable features, advanced technology or the combination of multiple massage techniques, there was general satisfaction with this model and a sense that this model provides excellent value for money.

It should be brought to mind though, that the ratings that have been given so far, mean that 21% of customers found the product unsatisfactory or not to their liking, which is equal to about 13 customers of the current 62 reviews. We will be discussing below what aspects of the product people found appealing and enjoyable, and also on the other hand, what elements caused dissatisfaction and disapproval.

Positive Feedback

Buyers of the Osaki OS-4000LS generally had a comfortable massage experience with certain aspects or features thoroughly improving their overall massage session. The positives of this chair which most reviewers agreed upon, related to the fact that it's one of the best value chairs in comparison to other models on the market. Also the chair's installation and assembly are relatively easy and there are many possible options for customised massages, which greatly enhance the massage experience.

Others areas of satisfaction included the OS 4000 LS's versatile and effective massage features, which deal well with back issues, and users reported feeling a ‘full body massage'. The compression airbags aided blood flow, leaving users feeling more relaxed, and the scanning feature was convenient because it determined the size of the person sitting in the chair, and thus adjusted to their body shape closely, which again improved the massage experience. Another element that multiple reviewers appreciated was the heat, specifically the heat lumbar therapy function which further improved the massage experience because it specifically targeted the back, which is typically an area of the body which many users have issues with.

Negative Feedback

There was a quite a substantial percentage of reviewers who disliked or found the Osaki OS-4000LS unsatisfactory in some way or another, so it must be discussed in order to warn our readers of the chair's potential problems. The main complaints were essentially about the foot or neck massagers being too weak, and insufficient in terms of delivering a strong enough massage.

Customer service was sometimes an issue for users, and they felt that they could not receive answers as fast as they would have liked. That being said, with almost all products we've reviewed, there's usually a small percentage of cases where a product has had reportedly bad customer service for specific users, and it seems that this is unfortunately largely a case of “bad luck”.

See The Reviews From Others Who Bought The Osaki OS-4000LS Massage Chair On Amazon
Are There Any Problems With The Osaki OS-4000LS?

It is evident that whilst the Osaki OS-4000LS has many features that appeal to its users body size and overall massage experience (with its various customisation options and versatile and effective massage features), there is still a considerable amount of problems with this particular model. It is vital here at Health Vibed that we include every review, both positive and negative, to ensure we can properly judge the product's quality and value, and so we must do the same when considering the problems regarding the Osaki OS-4000LS.

Areas of complaint included the massage strength being ‘non-existent' or ‘weak' specifically around the feet and neck, where users were dissatisfied with the massage experience (for example one user reported that the foot massage merely compresses, which only creates pressure within the airbags). It seems like the biggest problem with the Osaki 0S-4000LS is therefore the intensity and strength of the massage programs, where most claim it is relaxing and comfortable, but the rest of reviewers claim it is low in strength.

On the rare occasions where a customer purchased a faulty product, they clearly expressed their complaints and concern that a certain feature was not working such as the back scan functionality or the foot rollers. Fortunately, the return policy that was associated with the product allowed buyers to return the product without fail.

Despite the recurring complaints of weak massage strength experiences, the Osaki OS-4000LS is still certainly  a respectable model of massage chair, with many features that allow customers to experience as much comfort as possible, and it should be well noted that overall the feedback for this particular model is overwhelmingly positive.

The Best Places To Purchase The Osaki OS-4000LS Online

With so many online retailers out there, it can be a real struggle choosing which website to purchase from. However, with Amazon, you are supported with very tight security and protection against all sorts of scams and online fraud. This is because Amazon is the largest website for online retail in the world. It's literally used by millions, so it's understandable that Amazon has such a strong system of online buyer protection and will ensure you receive your product without getting scammed or potentially having your details end up in the wrong hands.

With any purchase, customer service and support will be a major issue, and this is especially the case if you're purchasing online, and even more so when purchasing a high ticket item such as a massage chair too! is highly recommended to ensure that big purchases will safely arrive and if you are actually thinking about the OS-4000LS, this may be your best option.  Click on the button below to check out's current pricing for the Osaki OS-4000LS: 

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Videos Of The Osaki OS-4000LS

To help give you a further idea of how The Osaki 0S-4000LS will look and feel in real life, here's some video footage of the very similar model (the CS) in action:


Image Gallery
Common Questions About This Model

Where is this model made? 

The Osaki OS-4000LS was made in China, similarly to all other Osaki massage chair models.

Is it difficult to move the massage chair after it is set up? 

The Osaki OS-4000LS is not difficult to move because it has caster wheels on the back of the chair meaning you can simply lift the chair from the ottoman and roll it around.

If I have an issue with the chair, who can I contact to get it fixed?

You can contact the manufacturer if there is a problem with your massage chair. Your warranty policy will ensure you get it fixed or replaced. Osaki's contact details can be found here.

What is included in the white glove service? 

Two delivery agents will personally bring the massage chair into your home to your desired location and assemble it. They will even bring it up flights of stairs, if you have them in your home.

What should I do if I am overseas when it is delivered?

If you would like it to arrive on time before you leave somewhere, you should order it 7-10 business days.

Where can I get this shipped?

You can get the product shipped within America but depending on your location, warranty may not be offered.

Does the product provide strong massage strength? 

The Osaki OS-4000LS should be strong, the higher the scale number, the stronger the massage (1 being mild and 10 being strong).

Does the chair fit me as a 5'2″ person? 

The product should fit a person of your height seeing as you are within the recommended height range and the air bags should also reach your outer shoulder and hips.

Is the product dual voltage?

Yes, its voltage is rated 110 – 120.

Does this fit a person who is 6'2″? 

It may be a little tight but they should be able to fit and remember to adjust the shoulder width.

Are there any unique features? 

Not exactly unique, but it is an improvement from the older models with newer features such as an L-track, shoulder width adjustment and a USB charging station.

Is it hard to assemble? 

Fortunately, it is relative easy to assemble, except two people may be needed to assemble the primary section.

How many positions does the chair have? 

There are 6 automatic massage programs, including relax, deep tissue, energy stretch, dual action, full air and manual air.

How many massage techniques are used? 

The chair offers 4 massage techniques within the massage programs which are kneading, shiatsu, rolling and tapping.

Does the product come with a USB charger? 

Yes, next to the remote control slot.

Conclusion – Is The Osaki OS-4000LS Worth Buying?

To conclude, the Osaki OS-4000LS is definitely a product whose value reflects its price tag, and the quality of this specific model chair is highly regarded, with several features including progressive massage techniques and diverse customisation options which enable the user to experience thoroughly relaxing massages. The fact that this chair has 3 adjustable shoulder widths allows it to shine when compared to other chairs on the market, because different body sizes are accounted for.

The 6 preset automatic programs and 4 massage techniques most definitely have to be acknowledged here because they are the features which really help the chair to create an excellent massage experience. The Relax, Deep Tissue, Energy Stretch, Dual Action, Full Air and Manual Air programs along with the rolling, tapping, kneading and shiatsu techniques will therefore target areas, providing ultimate pain relief and relaxation, especially in infamously tricky spots of the body such as the calves, thighs, spine or back.

There are however, minor flaws with this model, just as you might expect (as perfection is rarely found), including the differing massage strength experiences for users, and the varying customer service experiences. Overall though the feedback shown gives us the impression that this chair is indeed a valuable asset for anyone looking for a mid-range massage chair that will provide intensely relaxing massages within the comfort of your own home.

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The Osaki OS-4000LS Massage Chair Summary

Product Name: Osaki OS-4000LS

Price: N/A

Currency: USD

Availability: InStock

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