I bought this to replace another mat which after 10 years had cracked enough to be coming apart. But this one has the same sag where the wheels are and holds those sags even though it was designed for 3/8" berber carpet. I suspect it will fail quickly and until then I'll need to "work" to move my chair from wheel sag divot to wheel sag divot. But it does protect the carpet!
This is my 3rd of the same chair mat. But this time Staples had none in store so we [the sales guy and I] ordered it right there at the store. What arrived was a mat w/NO teeth.....well baby teeth....it slides all over the place on my carpet. I have to pull it back into place at least 4x a week. Too bad cause this HAD been my favorite mat and my fav place to buy the mat! Unless the sales guy ordered the wrong mat for me [the whole plus side of the older version WAS it's big teeth and strong/thick base] this present mat has NO grip and isn't made has hardy as all the others!