My chair rollers sink into the mat making large craters making it difficult to move the chair. Cheap price was attractive but it's a very cheap product.
Works as a chair mat should on a carpet. One can slide around on wheeled desk chairs and easily slide the chair in and out when putting the chair away. My "but" is that it is quite thin and your chair will cause valleys for the wheels to get stuck in. Then you have to heave a bit to move the chair to another spot. It's a minor inconvenience and the divots go away after a while and the mat returns to normal however I'm only 135 pounds and if I leave temporary dents I can only imagine what a 180-200 lb six-footer would experience. While I'm satisfied overall with this and it's not an issue that matters at all if you're sitting still I would buy Staples' thicker version next time. Otherwise quite pleased with this.