This High Pile Carpet Chair Mat is keeping moving a LOT on my thick carpet - does not stay in one place. Displacement is about 8 to 10 inches after an hour of use. The quality of the mat is good though. Also shipped folded round in a square box, not flat, as mentioned but this seems not to be an issue.  2.5 stars because you dont want to reposition it every hour. Will update this review if there is any change.