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.
This mat was exactly what I was looking for to smooth my "ride" now that I'm working from home and have to get up and down from my chair many many times a day. Much easier on my back and it's barely visible. My only caveat is that it came rolled up (understandably) and after I removed the heavy-duty scotch tape holding it in a roll I have not been able to get rid of the tape's stickiness which sticks to my shoe every time I walk over it. I've tried a sponge with boiling water and many attempts with Goo-Gone to no avail!