I bought the higher priced mat because is was advertised to be for plush carpets. Totally useless for plush carpets of any hight. I was trying to protect my new carpet but this mat is almost useless.
We use this mat under our computer chair to protect our wood floor. We have been very pleased with it. Our chair rolls well on it and the mat doesn't slide.
[...] I would recommend the item with reservations~ if it is the middle of winter and you can't warm it up outside I doubt you can get it to be flat enough so you don't trip over it.