The chair itself would be a 5 star, but there's an issue with the wheels.  The installation of the wheels is impossible.  They are to snap into the base with pressure to pop in.  After spending an hour myself trying to pop them in and giving up I waited for my husband who is 6'6 and about 300 lbs with a lot of strength to put them in for me.  Well after trying to pop them in and then trying to stand on the base to get the wheels to pop in, still they are not right.  Not sure what to do now.  It would have been a great product except for this design flaw.