I bought the least expensive chair mat knowing we intended to switch from carpet to a hardwood floor in my office so I knew I would need to replace this mat at some point down the line. I like the mat that I purchased but the only minor complaint is that sometimes it shows indentations from the wheels on my chair on the mat. Other than that I'm very happy with the mat.
I don't think it is going to last very long. It is too flexible to withstand the weight of a 195 pound person without the chair casters leaving a deep impression. It will eventually crack and splinter and chunks will pop out and it will then have to be replaced again...just like the last one.