The size is great but this mat is not made for a plush carpet. I just put mine down yesterday and I already have dents and divots. If you have a plush carpet find a different product.
We actually got this to go under the desk chair my husband sits in to paint (he's an artist with Parkinson's). The extra large size accomodates his need to move both sideways and forward/back. Strong sturdy. Also the edges curve down into the carpet so they aren't a trip hazard.