We are using two mats in a home work area over low-pile carpet. The rollers on the chairs do tend to sink into the mats and prevent easy movement but the mats look nice and stay put. Perhaps more expensive mats would not have the "sinking" problem but we didn't want to spend more.
Was a nice sturdy heavy mat. Did well on the high like carpet but some of the edges stayed curled even after weighing down with books. It's summer so I don't think the temp was too cold to prevent flexibility. If I had more time I might have kept at it but we returned it and will look for something else.