I just bought this chair a week ago. It is very comfortable. I have bad hips and back and this chair has allowed me to sit for long periods of time without pain. So far I can say that it is close to being the best chair I have invested in. I went out yesterday and bought a second one for my other desk.
Good quality and the folding arms make it easy to store under a desk. The only drawbacks are that there is no tilt adjust for the back and there is no way to adjust the armrest height.