What does 4D mean on this chair?

The rollers move in and out as well as along the back, so massage depth can be adjusted during a session. That is the main step up from 3D chairs, which vary speed and position but not depth.

Is it worth it over a 3D Osaki chair?

If you want deeper, more adjustable pressure and the full-body glove pattern, the 4D mechanism is the reason to choose it. A 3D chair covers the same areas for less, but with less control over depth.

How much space does it need?

It is a large recliner, so plan for clearance behind it for the recline and room to get in and out. Measure your doorway and room before ordering, since it is heavy and awkward to move.

Does it need assembly?

Most owners report a straightforward setup, mainly attaching the base and back sections. Two people help, given the weight.

Can I target a specific spot?

Yes. The spot pattern holds the rollers in one area, and the glove pattern runs a broader sequence. You can also adjust intensity on the remote.

Is it safe for people with back problems?

It is a massage chair, not a medical device. Check with a doctor first if you have a back injury, spine condition or are pregnant.

Where is the Osaki OP-4D Master Massage Chair cheapest?

At eBay, for $7,999.00, as of our latest check.

What do buyers say about the Osaki OP-4D Master Massage Chair?

Rated 5 out of 5 from 189 ratings.

Where can I buy the Osaki OP-4D Master Massage Chair?

12 stores we checked sell it, including Clearance Chair, Valencia Theater Seating, Official Osaki Massage Chair USA Corp., MassageChairPlanet.com, Wish Rock Relaxation.