It started cracking after 7 years a time frame I'm definitely not complaining about. I'm on a low-pile carpet and yes there are some divots that form but it's not hard to roll out of them. Purchasing a new one now!
Originally purchased a thinner chair mat (for berber carpet) it cracked in less than a few months. Purchased this one and it is still not stiff enough. It indents after sitting in for several hours and therefore chair does not role around which drives me crazy. It may also may crack over time. Looking for a much harder mat for medium pile carpet to avoid these things.
This hard floor chair mat is awesome. It covers the oak floor and prevents my chair from digging the floor up.It is great...no splinters from the floor