Good for me. I'm 5'10" and about 140lbs and this chair is wonderful for me. I sit in it anywhere from 8-16 hours a day without any discomfort. The mesh is very easy to sit in for hours (at least at my weight).
A comfortable chair when you first buy it but there are cosmetic and functional issues. There are factory labels at the bottom of the chair. They are held there by a cheap glue that does not let them peel off cleanly. If you try to peel the labels off you get pieces of residue of the label remaining. It looks very ugly. So I left the rest of the label on. This cosmetic defect is enough to reject the chair. The other problem is that you cannot lock the seat back from reclining. I discovered this after buying the chair. If I knew these things I would have bought something else.
The chair has great lumbar support. Has helped my posture while sitting at my desk all day. I don't find myself hunched over anymore. I bought five chairs for co-workers and they are loving the chairs as well.
I was not looking for a desk chair but saw this one and it was on sale at a very good price. I like the mesh seat and back because all of my previous chairs have flaked off after a few years. Also it is much cooler to sit on in the summer. It has a lot of adjustments to make it feel write for anyone sitting in it. I did not install the arm rests because I wanted to slide it under my desk. That was important and most chairs don't have that option. The only thing I was not pleased with was the fact that the store did not have any chairs in stock. I asked if I could buy one of two that was on display. They said yes but were going to add an assembly charge. Most times floor models are reduced. I didn't ask for a reduction but certainly didn't want to pay more so I ordered one and it arrived 2 days later.