I buy a new one about every 2 years for my home office area (its my primary area in the apt). I do a lot of up/down and rolling around - more so than when I was at work. The govt buys JUNK.
This mat is used daily at a computer desk. Chair remains near the same spot all the time. Have owned less than one year and already the cracks are substantial enough to need replacement.
I purchased this chairmat for my home office. It sits on the type of carpet one uses in their home (not commercial grade). I was concerned that it would not be adequate that I would need a thicker product. I took a chance on it. It works just fine. I'm very pleased.