The quality of the plastic is to soft and allows the wheels of chairs to sink into the soft plastic. The old fashion ones were much more durable. We live in a world of cheap merchandise that cost more than what its worth.
I needed a replacement for a chair mat that lasted a long time and was breaking up. This one is a bit smaller and I believe thinner and more flexible so far it's doing fine. The smaller size is not a factor; I actually like the smaller size. A definate plus it was on a half price sale.
I have had this mat for about 2 years. I work at least 5 days a week with my chair sitting on this mat. The mat protects the rug and allows my chair to roll more freely. After two years I need to buy a new one. As plastic mats in the past this one too crumbles. My next mat will be a higher priced rubber mat. "You get what you pay for" as they say.