the wheels dig in and you have to push out of indents. if you have a thin carpet with thin matting under it this is not for you. i'm thinking of taking it back.
When the mat arrived I was worried because it came without any packaging and appeared to be badly warped. But after a while in a warm room it totally flattened out again! Very pleased with how it works. No more scratched floor!
I have to reset this sliding mat several times a day. I bought the one that was supposed to be appropriate for the type of rug I have under my desk but it's not holding its position in any way that's useful. Very disappointed!
This chair mat seems a bit soft. The wheels of my office chair sink into it so I try to move positions regularly to keep from creating a hole. It seems to be good quality and it fits my space perfectly. Fair price too.