Having used this for almost a week I am still adjusting it. It tends to move and the more narrow end wants to curl up or not stay flat on the carpet. My chair does roll easily on its surface so that's a plus.
I put it down the day I received it. In no time were there divots. I have to move the chair every so often so I'm not stuck in them. It is a great size for the home office but it should be thicker.