I was a little worried that my chair wouldn't roll because it was so inexpensive but it works great for my office and I have it on carpet. I would recommend it.
Bought the mat to go with an executive desk in a low-pile berber carpeted office. My executive chair is large and just so long as I don't move around too much it's good. In retrospect I probably should have gone with a bigger mat and custom cut it to my liking/office layout.