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.
Someone had rolled these pads up and taped them using clear packing tape. It was a good idea to carry them easily but it took about 30 minutes with a rag and goo-gone to remove all of the tape residue.