We bought 2 of these mats. They are thick and appear they'll last for a long time. These mats have nubs on the back instead of spikes to hold them in place. The one under a rocker stays in place. The one under an office chair walks just a little bit (a little nuisance but not a deal breaker).
I've owned a Hard Floor Chair mat for a long time. Lately I purchased a new one and I am astonished to find out now that the mat doesn't only protect the floor but relieves muscle pressure. Distracted with work I hardly realized the muscle pressure used to stop my desk chair from slipping on a hard floor while working; what a great difference! Everyone should own one it is worth every penny.
This computer chair mat is nice. It works well under my chair and is easy to move around. It is however thinner than other mats I have purchased and therefore will very likely begin to crack sooner than I would like.
Works okay I guess but dents very easily. therefore sliding back and forth is really not possible. Would probably work on flat carpet but I bought it since it said it was for carpet up to 3/4" thick. This carpet is not even 1/2".
Dents fairly easy. Have to make sure wheels don't land in the same space or you have to roll out of the dent. These mats will never be as firm as a floor so it works well enough.