Arrived as expected flat and unrolled -- so far seems to be holding up on a medium pile carpet. I did however lay it on top of my previous mat which had started to crack. This should support it better.
Got it wrapped in adhesive tape that would not come off. Had to buy goo gone and spend many hours getting in off. I paid pretty good money for the Mat but was disappointed that it was delivered with melted adhesive glue all over it.