This mat is too flexible for a medium pile carpet. In 22 years of working from my home office these are probably the worst chair mats I've ever purchased. It remains to be seen how long they last but I'm not optimistic. Would probably be more suited for use on a low pile carpet.
Floor mat is fine and I hope it lasts longer than the previous one. Mat was delivered filthy with no wrapping. Footprints were on smooth side indicating delivery person had walked on it with dirty shoes. Studs on other side were full of white pieces of something (paper cardboard fabric?). Had to spend a half hour cleaning and washing the mat before we could use it.