My computer desk chair with 5 wide rollers started to sink into the mat with only a few days of use. I can see this failing in a mater of months. The mat material used is not suited to this type of use. By the way I am not overweight.
It fit perfect under the desk and will keep carpet protected also wheel on last chair probably broke from not having the chair mat. On sale good price!
I've had this chair mat a few weeks and so far it is great. I can't speak to the longevity of it but it seems to be strong and well-made it provides good support for my chair over fairly thick shaggy carpet and it doesn't smell like petroleum. I hope it lasts a long time without cracking like my last one did.
As soon as I put my desk chair (5 point ball casters) on the mat divots were created. I could not easily move the chair. I didn't even sit in the chair yet! This does NOT work for medium to high pile carpet at all. The advertised use is completely bogus.