I rate this as average does help chair to roll on carpet. If it was thicker the chair would roll much easier when sitting. the product does have a chemicle smell for about a week that is not pleasant. We put ours outside on the patio to air out for a week. the price was a little more than i thought it should be but to be honest i should have shopped around more. the quality is average would i buy it again i don't think so. I have been a customer of staples for over 15 years but am thinking i should start shopping around and comparing products and prices.
I found the chair mat on a special on the internet. With the discount it was about $16 I could not believe the price. It was rolled up at will call for me so I didn't inspect it at the store. Unrolling it at home I was very surprised at the quality construction. I would recommend this mat to anyone who spends many hours at their desk.
We have residential grade berber carpet with an upgrade waffle pad beneath. No problem for the plastic grippers to maintain their hold. We placed the 36" x 48" lipped Staples carpet chairmat under a large swivel 5-wheeled computer desk chair in our den and it works extremely well. We also placed the 45" x 53" lipped Staples carpet chairmat kitty-corner under our L-shaped computer desk and the smaller 5-wheeled desk chair that we use with it. Each chairmat provides all the space each of us needs to roll our respective chairs back and forth or swivel from computer desk to regular desk quickly and quietly.