Our old chair mat had discolored and was cracking. It was a very heavy weight mat that stayed pretty flat, but again it was really old. We rolled this one out in our foyer and put paint cans on it to hold it down for a few days (like suggested). It still isn’t flat all the way, but that will come in time. When the chair wheels sit in one spot, they do create those “pock” marks, but so did our old one because our carpet is thick and no matter what we put on top (unless we used wood), it would do the same thing. I think this one was a good value.