The number of stars I gave this product has no meaning since the usefulness of a Chair Mat is only discernable over time; i.e. like how long before it starts to crack and break down. Hopefully I won’t know that for a long time. (It has been under my chair for a week now and it still working.)
I would not buy this product in the future. The plastic starts to indent where the wheels of your chair are and thus create molded indentations that the chair gravitates to. I needed a pad that would NOT do this. I'm going glass next time.