Have had for several months now and sometimes use for up to 10 hours a day. By far the most comfortable chair I have ever had. My clients have remarked upon how nice and expensive it is although I paid a bargain price for it. My husband put it together in a matter of minutes without any problems. Use two desks that I rotate the chair between it rolls and adjusts easily between the two. When my assistant needs a new chair this is the chair I will purchase for her.
I bought this chair because I wanted something that would be comfortable and adjustable. Still working on adjustments but I am happy with the purchase. It took two of us to put it together (one holding pieces in place the other screwing them together) and adjustments also take two--one to sit and the other to move the adjustment knobs.