Very comfortable. The only chair I found that holds my back in the straight/upright position while I type but will lean back with support if I wish to do so. The others are ALL in a position that have you leaning further back while you work at your desk which puts a strain on the neck and shoulders.
I love this chair. I am 5'11 and the chair is the perfect size for me. the neck support is amazing while reclining. I personally love the mesh since it is so breathable. This is a very important feature to me over leather/faux leather when sitting for long periods of time.
I love this chair. I have back issues and this chair definitely gives me the support I need.. I would absolutely recommend this chair to anyone with back issues.