I got this in comparison to a Herman Miller Aeron chair and it does an excellent job at a fraction of the price. I did upgrade one thing and got some of those replacement wheels that are like inline skate wheels. Now it glides like a dream. Also got the replacement plan to combat those reviews that said the material tore well if it does now it'll be replaced. So I'd say an overall excellent value and comfort level.
Pros: SUPER easy to assemble. I can't put anything together and this was so easy. Like 6 steps of screws. EASY easy. It's the only reason it got 2 stars instead of one. Cons: Literally everything else. I have no idea how this has such high ratings. I have wide hips and they don't comfortably fit in the seat. I'm 5'10'' and the headrest is too short for me. Best for someone under 5'8''. Last but not least the seat itself... it's SO uncomfortable. My butt was hurting after sitting in it for like minutes. Thankfully it was easy to put together because I will be taking it apart for a very prompt return. I'd say if you're taller than 5'8'' and weigh over 225 pounds I would definitely NOT get this chair.
Chair is nice and easy to assemble with included wrench. The problem is that I am 6' tall and the seat is too short and the head rest is very low and hits my shoulder blades at its maximum height... needs to be about 3" higher so I must remove it. The chair is nice but realistically only for shorter people... probably 5'6".
I love this chair. I have had my share of desk chairs. This is by far the most comfortable and ergonomic chair I have owned. I am really impressed with my new chair.