This particular chair mat is really only good for light duty. I do know weigh very much I have an office chair on rollers; and the rollers mold themselves into the plastic mat. Not easy to move around once I sit. And the carpet that is under the mat is heavy duty indoor/door (not plush at all).
Sits on the floor where I put it. Lies flat. Doesn't move. Protects the hardwood. It's everything I wanted it to be. If you want a chair mat that will do all the things a reasonable person expects a chair mat to do then this chair mat is an excellent choice.
Despite the naming issues -- my flat pile carpet does not actually have a lip -- but the mat does and it is vinyl. And the little prongy things go DOWN into the carpet. And it works great. Good value and in all seriousness it does not curl as do some. So good on you Staples.
the mat is light weight and barely holds the wheels of the chair from indenting in the mat. If this mat is used to protect the carpet it should do that; if it is used to facilitate the wheels of the chair rolling on the carpet - not really.