The grip pegs on the bottom are not long enough for the thickness of the carpet under it. I bought it because it was the only one available with an under-the-desk tab which fit the opening I have. It will probably crack with age but it was cheap enough if it lasts several years.
Laid it out and let it "relax" from the rolled shipping position for a few days (as recommended) before using but within a couple days of use it already had cracks in it. Now a few months later and it's completely breaking apart and needs to be replaced already.