This is an item that is for light duty and therefore worth the price. Miy previous one lasted almost a year before cracking. Not bad for the price. A heavier duty item would have been preferred but the store did not have any in stock. If you have a low knap carpet this should be just about perfect for you needs.
I'm a 230 lbs person and I have not had any problems with my office chair sinking into the mat on old carpet (3/16" of pile left). I have been impressed with the stiffness of the mat but not the cleats on the bottom as this mat still moves about an inch each week after 40+ hours of use. Hence the 4 stars.
Mat itself is as advertised and perfect. However it had to be returned and replaced because someone had written "26" on it with a permanent black marker.