It's pretty comfortable to use for extended periods of time. I like the mesh design for the ventilation to stay feeling cooler - no back sweat one can get with a solid back and seat.
I work from home and use it every day. Easy to put together adjustable have had it for a few months now and no complaints. I only weigh about 155 lbs. so the sinking mesh problem others point out hasn't really been an issue for me. For heavier folks I could see the mesh potentially stretching out and causing issues.
I deal with some hip pain from sitting and this chair is the only one I can sit in for hours with zero pain! I love it! The mesh seat is absolutely perfect. I take one star off because the neck support does not adjust down enough to hit my cervical/neck area where it belongs. Not sure why--I'm pretty tall but it's high. Hits right at the base of my skull so kind of pushes my head forward. However given that I rarely sit back at a desk chair it doesn't cause a problem.
The chair is perfectly contoured for my bad back and allows freedom of movement and the appropriate support. It is easy to clean and slides perfectly over the floor not marring the wood.