I purchased two of these chairmats for a home office. They work so well and it's nice to know that the new carpet won't be damaged by rolling office chairs. Only con was the strong plastic smell when I first purchased them.
This is good for low pile carpet. Do not use for higher thickness carpet. The Mat will crack in time if you do. Otherwise it is a great protection for your carpet.
I sit in a chair on top of mat for 8-9 hours a day. Do a little rolling around on it but otherwise pretty stationery. Not had mat all that long so I'm not sure about the durability. Looks nice and is providing the service that we need for now.
About a week after I made the purchase Staples published a "10% off any purchase" coupon in one of their advertisements. Had I waited I could have saved myself a few dollars.