Besides the mat and other purchases I made I want to congratulate you for the excellent customer service at this store the employee was very helpful and kind he helped me to find the product I was looking for gave me suggestions in others that you didn't have in stock and helped me to put all my stuff in my car.
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.
The purchase on the whole was Great except I had purchased the same Mat about 4 years ago. When I purchased it then it came rolled up as wrapped in "shrink wrap" in 2 places around the outside. This one was not wrapped which made it somewhat difficult to handle. That's probably why they charge you a service charge for special handling.