The instructions say not to use it on thick carpet with a pad. However I couldn't find anything that would work better so this is what I bought. So far it is working fine. It does get indents but they come out after I leave my chair.
This pad would probably work fine on 1/4" carpet with no padding but consider a heavier weight mat for any thicker or padded carpet. Chair wheels tend to dent the mat when used on thicker or padded carpet.
i have a thick plush round rug in my home office and was always getting stuck when i rolled back and was usually flipping or bunching the rug up every time i moved. buying this mat was a great solution to my problem.