I felt that the method by which they were shipped was very poor. They were warped and bent out of shape. It took some time just to get them reasonably flat. Previous shipments where much better
Didn't like the softness of the plastic. Used on rug wheels from chair would sink in a bit leaving an indentation. Also not very easy for chair to slide over possibly because lack of hardness in plastic. Maybe best used on industrial type rug or carpet.
Our office is carpeted with pretty heavy carpet with pad and it is difficult to get a pad that stays "smooth without dips". This pad is doing very well a little dimple under the chair wheels but I have no problems! I like it!!
I was looking for a smaller mat and the size of this is what I wanted but I do find it to be very thin (compared to others) and the office chair doesn't roll as freely on it as some of the other thicker ones. But it's working out ok.