It was good for the small bedroom wasn't exactly very heavy duty but I bought the lightest and smallest one at that was so I can't expect anything better
The mat is as described and appears to be of good quality. It easily flattened out from the roll form in which shipped. Until it has been used for a long while it is impossible to know whether it will dent break or crack from chair wheels rolling on it.
I work at my desk 7-9 hrs per day and purchased the matt to protect a medium pile carpet. Within the first few hours my office chair was sinking into the plastic. The entire matt also shifts with use (it has "teeth" but they are very short/dull points) and I have to rearrange the mat nearly every day. DO NOT WASTE YOUR MONEY - instead buy a sheet of plywood and have it cut to size you need.