Good quality mat that would probably work well on low pile carpet. My carpet is brand new medium pile carpet and the mat moves around. Also indents form from the wheels of a regular office chair. The good part is that the chair doesn’t leave indents or tracks in the carpet underneath. The mat does a good job of protecting the carpet which is what I bought it for.
My office chair sank into the soft plastic and couldn’t roll freely. Why it’s marketed as being for “Extra Carpet” is beyond me; I can’t imagine it working on anything but hard floors Returned it the next day and Staples took it back without any hassle.