Paid extra for this mat because it was suppose to be the best for medium thick carpet. There is NO GRIP whatsoever on the back of this mat. Constantly having to slide it back over so my chair wouldn't roll on the carpet. Maybe I move too much but hey carpet mats are supposed to make it easier to use your rollers! The material is very strong but design is bad.
I bought these mats before and they lasted about 9 years - depending how much you roll your chair on it :) It was time to buy another one and it still has the same durable feel to it.
This chair mat protects as promised. Mine came perfectly flat when delivered so no "un-curl" time! The only issue I have is that the first time I stepped on it to sit in my chair the mat slid several inches and I had a nice little ride! Phew! I'm just more careful when approaching the mat.
I got one of these years ago and that one was good. This one is flimsy. It comes all rolled up and will not lie flat when opened. I put mine out in the Arizona heat with weights on it on my back porch for a day to try to flatten t. That helped but some of the edges just won't flatten- they are curled up on the corners and you catch your foot on them.