would never recommend chair does not glide over as the plastic is too thin and the rollers on the chair still dig into the carpet under the plastic. I give it a big zero "0000" no stars the only reason it got 1 star is because the system does not allow me to give it a zero rating.
Seems like mats we bought will be fine for a good period of time and protect carpet well. Could possibly be a little firmer although my wife at 130 lbs. doesn't have any issue. ( I'm 200 lbs.)