It's comfortable leaning back is great. I use this chair at home and I can sit in it for long periods of time although I periodically lean back a lot which probably helps put pressure off my booty. While I'm sitting up the chair promotes good posture. However sitting at the very front edge of the chair will feel uncomfortable after a while since it is not designed to support your full concentrated weight there. The bottom is airy enough so that your bottom bits will not heat up too much which is nice. The chair I use at my office has a tempur-pedic bottom. After the years it is no longer comfortable for long periods of time so I have to get up after a while. Overall this chair is nice and I'll probably be using it for many years to come.
The back of chair is not supportive and the arms rest are very close to body. Either squeeze into the chair or lean on desk to work. Strain on shoulders and neck. 2 stars are for the appearance and material.