Hard to go wrong with a piece of plastic but it has made my office chair much more manageable. Just had new carpet and underlay installed and couldn't move my chair at all. Worth the money and fast service and delivery! Highly recommend!
The mat's clear and looks good. It works decently well on a medium pile carpet. It gradually moves a little bit (a couple of inches) over a period of a few days but not too much if you don't roll around the chair all the time. It gets indented if you keep the chair in the same position for some time so I just rotate the base of my rolling chair once in a while to let the indents go away.