My Steelcase Gesture has uneven armrests, after I noticed it I also checked other chairs in the office and almost every one of them has this flaw. It's not much - maybe 0.5cm but it is impossible to adjust it to same level. It's not that much of a problem - after sitting for a while and concentrating on work my mind loses 'awareness' of this problem (or maybe body adjusts? skews?)
Another thing is that seat/seat angle is profiled in such way that I have feeling of slowly sliding down over time.
Overall chair is sturdy solid etc. but for this price it shouldn't have mentioned flaws. I wouldn't buy it again.