Works well except that I left it in my trunk for 1.5 days (it gets hot) and one corner of the mat is now bent up and catches feet or chair casters. I'm sure it will eventually ease back flat if not I'll take a hair dryer to soften and flatten it.
It isn't quite as heavy duty as my last chair mat which lasted about seven years. I don't expect this one to be as durable. It was a reasonable price though I have to say.
This mat is working well so far. It gripped effectively on a shallow carpet. Had to let it sit out for a little while at home for it to uncurl. It's small so only good if you don't move widely.