This task chair has a bigger seat than expected and it feels a little too firm at first but is actually great support. The mesh back is comfortable but can wear easily and snag with pants pocket snaps/hooks. Great adjustable side arms without cushions to tear/wear so they are a bit hard. Great back support.
Besides the expected adjustments and features I have to say that this chair has greatly improved my posture and comfort. The back has great lumbar support and the sliding lumbar control adds even more customization to it. I am a relatively big guy and I find it comfortable to sit on for at least 2-3hrs straight before I need a break (pretty normal).