This chair mat is good quality is a good size and and generally works well but on my carpet (medium pile - nothing unusual) the mat tends to deform under the weight of the wheels. This leaves indentations that keep the chair from rolling smoothly. I would prefer a more-rigid mat.
It's a good mat and I'm sure it will do what it's supposed to do i.e. protect the carpet from being beat up by my chair. After only about a week or so of use the wheels on my chair are putting some serious divots into it. I'm using it on a berber carpet with not a lot of pile. Don't know if that would make a difference. I'm thinking I should have got a hard mat instead of this soft one.
The mat moves around constancy relocating it. It's thin the wheels on my chair sink into it. I would not recommend it I was debating to return it but the 15 day return passed.