My review is for the black adjustable version of this chair. I have been using this chair for over 1 month now and I am quiet pleased with it. In fact, this chair has become the main chair at my desk and considering I have a "desk job", I suppose that says a lot. Just want to mention that I am a rather short person, 161cm, and that was the reason I chose the adjustable chair. That was certainly the right choice for me, as I could adjust it to my size and whatever position feels best to me. My husband happened to buy the other non-adjustable wooden version of this chair, so I had a chance to compare them. Indeed, the non-adjustable wooden chair felt too large for me, I kind of felt like a kid sitting on the edge of the chair, also the material on that one is a little bit slippery for my liking. Both chairs were fairly easy to assemble, I had no problem with that. The only maybe negative about this chair so far is I am wondering how long the sponges inside the cushions are going to last. After sitting on it for 1 month (at least 8 hours daily) the cushions have indentations on them in places where I sit and where I kneel. At this point in time that doesn't seem to bother me in any way, but only time will tell if they eventually flatten completely. Hopefully not. For that reason only I would rate this chair 4.5/5