I initially had issues with a broken part but that was replaced by a different part.  I liked the chair initially overall - the height is perfect and it's comfortable, but after a few months the chair lift or piston started having issues.  The chair would sink to the floor periodically and I'd have to adjust, but one year in and it's happening all the time.  I was hoping the chair would last more than a year but now I have to find something else.