After a week of use I'm very happy with the feel and sturdiness of the chair. One star subtracted for assembly which is straightforward enough only after one figures out the truly awful graphic instructions. And you'll want a second pair of hands to hold the assembly in place while you're trying to tighten the bolts.
I found the lumbar support to be extremely comfortable and my only complaint is that that gas cylinder keeping the height up is somewhat weak. I am 240# and after 3-4 months the cylinder slowly lowers. If you are a bigger person I recommend the warranty addon to give you three years of service