I am using this product on top of a low pile carpet and it works well. It is colorless so it is not distracting. It stays securely on the carpet and can be easily wiped. The only "con" was that the tape around the rolled up mat needed to be cleaned off with an all purpose household product (took some elbow grease) but Staples Customer Service said that they are working on this with the manufacturer.
I bought it to replace an inexpensive mat that I had for several years. This mat turned out to be lighter than my first one. I returned it the next day and paid quite a bit more for a better one.
This is the second matt that I have purchased. I use it on a plush carpet and over time it breaks up. It does seem to discolor over time. I can't remember how long I have had the one I have now. It does make it possible to roll my chair on the carpet and saves the carpet from the chair.