I have low pile carpet and initially purchased the “Medium Pile Mat”. This mat was too soft so I upgraded to the “High Pile Mat” which works fine… If you are thinking of purchasing one of these mats regardless of your assumed carpet pile height I would recommend purchasing the high pile offering. This way you will be sure to get the stiffest mat available from this manufacturer. I cannot attest to how the High Pile Mat will work with High Pile Carpet.
I have a very small office in my house. Carpet made moving the chair difficult. Bought the smaller chair mat which took care of the problem. Price is reasonable too.
A good heavy-duty carpet protector must have enough rigidity to keep the weight off the carpet below. This is a lightweight piece of plastic which will require replacement even with light use.