Although I found this chair comfortable for the first few months it began to sag to the point where I have back pain every time after sitting in it. I am around 150lb so I don't think this should happen. Would not recommend.
The chair is ergonomic and comfortable. It's easy to put together as well. My only complaint which is a major complaint is that the headrest is entirely too low. I've extended it all the way and it's more of a neck-rest than a headrest. I'm not a huge guy either. I'm 6ft so I'm definitely on the taller side; however in my opinion the headrest being this low is unacceptable.