It's a pretty sturdy chair overall but the mesh cushion does sink a lot (even when brand new). I'm 5'11 145lbs and the sinking makes my tailbone hurt after sitting for longer than around 30 minutes. If you're on the larger side it may be even more of a problem. I would definitely recommend either sitting on a pillow or extra cushion to provide extra comfort.
I have bought this chair 4 times for a reason. I realized how great this chair was to my back and I had to show others how comfortable they can be. I gave one to my agent and one to my sister. My agent has had his for over 6 years now and it has fit him perfectly. Buy it it’s worth it. The lumbar support is perfect and the mesh keeps me cool on those long work days.
Very comfortable chair. Easy to assemble. 55 years old woman assembled it by herself as a birthday present for her husband before he woke up. Thinking about getting one more for myself.