This mat is on a medium pile carpet. It immediately developed "dents" under the chair wheels. I have had it for only about one week so I do not know if it will develop any other weaknesses.
Purchased this along w/a taster chair & it was just what we needed. This is made of THICK plastic that STAYS in place!!! My hubby is a BIG guy & he can roll his chair across it as if he were in the office rolling across the thin office carpet. I’m a believer in reviews. Take my word & BUY this!!! I placed it over the carpet in the basement it rolls very well!!