The whole purpose for getting a Carpet Chair Mat is to make it easier to slide your chair. I've had this mat for less than a week and it's got dents under the wheels so deep I can barely move the chair. My previous mat lasted years and had to be replace only because it was starting to crack with age. It cracked but it didn't dent. Wish I still had my prior one.
I have had previous chair mats (same size) that were a heavier thicker plastic. I am finding this one to be lighter than expected and chair impressions form more quickly than preiously.