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.
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.