I did so much research and was about to shell out ~700 for a high-end chair then came to my senses and found this guy. I don't understand how some people can spend so much money on a chair. Anyway I'm 6'4" and 215 lbs and this chair fits me perfectly. My fiance who is 5'7" also finds it really comfortable. My only complaint is the plastic used to secure the backrest into the seat. The screws come a bit loose and the backrest gets a bit wobbly and I need to re-tighten the screws. Other than that this chair is great. I work a 9-5 in it 5 days a week and have 0 back problems and the chair is supportive.
We just assembled two of these chairs and one had a extra piece of plastic near the screws for the head rest. Good that we had the ability to carve that plastic off. So far we haven't used the chairs as they are in a new office area. They are comfortable and look great in our new room.
The part right below the wheels support cracked and now the bar goes all the way to the floor and drags so you can no longer move. I had a mush more expensive chair that lasted for over 15 years. I could tell when I assembled this chair the quality was not great but was hoping it would have lasted longer.