Seems like mats we bought will be fine for a good period of time and protect carpet well. Could possibly be a little firmer although my wife at 130 lbs. doesn't have any issue. ( I'm 200 lbs.)
Inexpensive and works just fine in my home office. Like my last one I had it's on the smaller side like I wanted. Even though it says it's for flat pile carpet it works perfect on my regular carpet. Pretty sure it will last me at least two years.