We have had multiple floor mats that have cracked and curled on the edges within a short time of installing them - even though they were the correct ones for our office situation. This mat seems strong and pliable enough to stand up to the rolling of our desk chairs. The underside nubs do a good job of gripping the carpet yet are not so sharp they are impossible to handle without getting cut. And it has a lifetime warranty!!! We liked the first so much that we just purchased a second for our other office chair.