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.
Should have read other reviews. Flimsy thin edges refuse to lay flat. Chair casters cause dents hard to move chair. Used for one day and going to take it back.
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.