Even on a flat pile office carpet this mat was too soft. Dents would form where my chair had sat even if I wasn't sitting in it at the time. I chose to exchange this for a firmer better quality and slightly larger version.
After reading reviews for this mat I hesitated before buying. Then I found reviews of more expensive mats had the same poor reviews. I guess people are buying it for the wrong applications...this is for a low-pile carpet...not wood floors or heavy-pile carpets. I expect to get years of use from this product since I purchased it for the proper application So-far so-good.