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.
Having purchased the thinner mat previously which only lasted a couple months this mat seams to be more of the “medium” grade quality and should outlast the thinner product by several months. This mat is of great quality and considering the total combined weight of user and chair is approximately 200 lbs it appears to have great lifespan potential.
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.