I put the mat down and put my office chair on it and have been sitting in the chair and wheeling it around for about 4 days now and so far it's working fine. The mat is softer than some but so far that isn't interfering with my use. For the price I'm very satisfied.
Great for my L shaped desk area. I have a small armless chair on wheels and the chair mat fits in the L so I can roll easily in my chair. I bought the wrong one initially but the staff at staples was very helpful in helping me get the correct one.