I wish I could give it 4.9 stars.  It's a great chair but not absolutely perfect.  I love many things about this chair.  It rolls around very well on my glass chair mat.  The arms are adjustable.  I was hesitant about the mesh back, but I've ended up liking it.  It seems sturdy and very well made.  It was easy to put together.  I could sit in this chair forever without getting uncomfortable because it has an adjustable back stabilizer.  I'm not 100 percent excited about the seat.  Despite my organically padded backside, the seat doesn't seem cushioned enough.  I saw other people mention that also.  That said, it's not a hard seat, and it's not uncomfortable -- just could be more of a positive experience with a more heavily padded seat.