I've had this chair mat for 2 years and it recently developed a crack. I took some pictures and sent it to ES Robbins and they made good on their warranty and sent me a replacement for free! Thanks!
I like this mat for my home office. The size is big enough and the mat holds up well even with daily use. I have found that it is important to keep the mat from getting bunched up or crunched up against the desk legs a wall or another piece of furniture. When this happens for a period of time the mat takes on a new shape and can't be returned to it's original flat shape. Then you buy a new mat and write a review similar to this one.
I was surprised that the large Carpet Chair Mat was left outside our front door on the sidewalk. We had to clean it off when we brought in the house. It should have been placed on paper or wrapped.
It's OK but it still creates dents that cause the chair to roll back into them if you don't move a reasonable distance away. They do flatten out though. The mat also walks on our 3/8" carpet. This being a thicker mat I was hoping the walking and dents would not be present.