If I could, I'd give this a zero rating!
I bought this chair mat about 2 months ago.  Today, as I was sitting on my office chair, the mat literally shattered into thousands of pieces.  It was like an explosion with a big bang.  Took me an hour to clean up the mess.
I called Wayfair, and was basically told "too bad; your outside our window of eligibility so there's nothing we can do".  She offered to give me a manufacturer's number, but couldn't tell me who the manufacturer was.
So - the product is rated zero, and customer service is rated zero.