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.
The size is the real issue. The next size is too large (for me) and this size is a bit too short. It needs a larger rolling surface. When the chair rolls off the end it's very annoying to get it back on the mat. Probably too thin for business use but fine for home. If you can use the next size get it.