Arrived when scheduled by free delivery. Definitely go for this sturdier mat if your carpet has any sort of pile. It will still dimple with concentrated pressure over a small area for example the leg of a non-rolling chair but works well for rolling office chairs.
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.
The plastic is very thin and does not give good support. The wheels on my chair sinks creating a low spot. This makes moving the chair very difficult. I weight about 200 lbs and that might cause some on my issues