This is the best desk chair I've ever had. My husband has one and when my old chair disintigrated I opted for the same chair he has. The only thing I would change is the arm rests. They move out of alignment too easily but then they are easy to move back.
The chair is extremely comfortable and helps tremendously with my back and hip discomfort that occurs after long hours at work. Not cost efficient and the arm rests are a bit aggravating with the way they move out but the comfort and support are fantastic!
I bought this chair because mesh is the only surface I can sit on with comfort due to some nerve issues. The available adjustments are great. The only thing I found uncomfortable was the lumbar seems to be pushing my lower back out too far. I ended up adding a small pillow behind my back to "even out" which helped.