This mat didn't work from day 1> The wheels made an immediate groove and now I can't move the chair without strenuously pushing it from a sit down position or get up to move it. Ugh I will probably return it
My chairs seem to sink in a bit more that I would like. I've got Berber carpet (presumably with padding under it). I sometimes have to work a bit to roll my chair out of the impressions it creates. The nubs on the bottom of the mat are shorter and duller than those for normal carpet; they appear adequate to the task.