It is under my office chair in my home office. It is better than trying to roll about on the carpet unfortunately I manage to create lovely little depressions when I sit in one place too long. Those depressions seem to be permanent (probably because I am a big person). But no worries it gets the job done.
We use these in the office and they get quite a bit of use. We have been using them for quite some time now and they last a long time. I have no negative comments at this time. I'll buy them everytime.
Did not want to spend the money but the carpet needed the protection as I scoot between 2 computers back and forth. I was hesitant to get one because I also hop up a lot to the printer etc and I did not want the chair to slip out from under me. So far its been just what I needed. I think I move arond enough that the chair dents will be evenly distributed but it is the econony one so it is on the thin side.