The carpet chair mat is too thin and flimsy. I have a small-size office chair on rollers and the rollers have already made deep dents in the carpet chair mat. I had the old one for more than 20 years without this problem. I would gladly have paid more for a mat that works.
I bought this as a gift for my husband who is not a heavy person - maybe 185. The mat has dents in it from when he sits in his chair ... at the space where the rollers are. The dents don't come back up and it makes it extremely difficult to roll back and forth. I would never recommend this particular product.