Great mat for the price. I was using a heavier desk chair and it did make large "divits" that were a little difficult to roll out of. I switched to a little lighter chair and it's been better. Definitely better than not having one but if I do wish I had invested in a little thicker mat.
I have had a terrible time finding a chair mat that doesn't slide on our carpet. (Would you believe 6 attempts) This one is designed for a "1" pile carpet" and is thicker that previous mats I've tried. However it still moves until it hits my desk but at least so far it has not curled up. So I plan to keep it for awhile.
It works okay on my berber carpet. My chair had already made indents into the carpet so with the mat on top my chair tends to roll to where the indents were.
So far it's working out like the one we had to replace that one lasted a couple of years but being plastic plastic does have a shelf life and gets brittle and cracks so if I get the same time with this one I will be happy