This chair mat works perfect it is more durable looking than the old one and we had the old one for 6 years. So hoping to get 10 years out of this one.
It is made for very thin carpet. While rolling over with an office chair the mat moves; after it has moves three inches I have to reposition it. The reason it moves: the protruding fingers on the back-side are way too short and not pointed enough to grip into normal carpeting.
This mat is good quality and performs well. This mat is medium thickness (mils) and is a very good value for the price. Thanks to Staples for the ability to compare the mil thickness of different mats and free next day delivery.