We have ordered 2 of the chairs.  The first one was so perfect so we ordered a second. But the quality control on the upholstery on the 2nd had a lot to be desired.  Called Wayfair they sent us another chair which was perfect.  On both chairs the rollers were hard to put in, you really have to push, grunt and maybe say a couple of bad words.  But once they are in we have have no problem with stability or wonkiness.