Recently purchased the Staples Hyken Technical Mesh Task Chair. Love the lumbar back support and the breathable mesh...very comfortable especially in hot weather. Only complaint on the chair is that the head rest does not raise enough to avoid hitting the shoulder blades of someone 6 feet or taller. It has a tilt feature and if I raise it to the max and tilt it back the max there is less headrest pushing on my shoulders. I'll have to try it without the headrest to see if that is worth it.
This chair is quite comfortable even during extended sessions. Assembly was well documented and easily accomplished. All parts were in separate sections making it easy to identify which part was required next. One thing of note it feels like it's designed for smaller individuals (like myself). I may purchase another one for my desk job...