We bought two of the Kroy Mesh Task Chairs and they're awesome! They have the back support we were looking for and are very sturdy. We like them so much we are thinking of getting another one or two.
Easy to assemble. Like having a chiropractor work on your back while you are at work! It forces better posture which is a good thing. The mesh helps you stay cool for long periods of time. lots of adjustments..
It's always a gamble when buying a chair in which you haven't sat. This chair is very good but I wish the seat were a little longer. It is comfortable and I like the mesh for both seat and back.