An office chair with five casters moves much better with the vinyl mat on top of the carpet. The price was economical but a more expensive solid mat would work even better.
This chair mat was the only one available and is not nearly as substantial as one I purchased a few years age. The mat is on low pile carpet and Imprints from my desk chair are clearly visible. I do not recommend this mat.
I would not buy this product in the future. The plastic starts to indent where the wheels of your chair are and thus create molded indentations that the chair gravitates to. I needed a pad that would NOT do this. I'm going glass next time.
It came (delivered) quickly & in pristine shape. I ordered one for a low pile carpet but it is hard to roll after sitting in one position even for a short period of time. The mat tends to give under the weight of the wheels on my office chair and I have to roll the wheels into an alternate place on the mat in order to move around. It doesn't mark up from rolling over it but the indentations make the rating lower than I had hoped. BTW I am under 170LBS so my weight shouldn't have been a factor.