Very flimsy mat. It would work great on surfaces without any carpet at all. Our low-pile carpeting makes the chairs sink in and put grooves in the mat. It's just a matter of time before the chair rollers break through.
I've started replacing all of our chair mats with this one because it can handle the weight and constant pressure from even the heaviest user. We bought the thinner and less expensive chair mats that were made for the type of carpet in our office and they would crack and crumble within weeks especially for the bigger men in the office. I've purchased 7 of these and haven't had any complaints since I bought the first one almost 2 years ago. The initial cost seems high but I am no longer replacing the same chair mats every couple of months.