We got a chair mat for our computer desk over 10 years ago. It took over 8 years for it to form a spot that the wheels rolled into. The one I just got was the best one they had. It took less then 2 weeks for it to form a spot for the wheels to roll into. If I knew that I would of just used the old one.
product is a little thin and a heavy chair wheel leaves an indentation. also it was supposed to work well on heavy pile carpet but it works better on light pile carpet.
Quite unsatisfactory item. In contrast to the one I purchased previously from Staples this one slips on the carpet requiring frequent adjustment. I shall be returning it.