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.
I bought this to replace one that was cracked and my chair wheels kept getting stuck in. Although this has no cracks the chair sinks into a location and won't roll unless I stand up and take my weight off the chair. I don't recommend this one. Worth the extra money to get a firmer one which will allow your chair to roll on it.