I just purchased a 18x24 inch mat from Amazon last night.
Can't wait to get it, I have worn out TWO Olfa mats in the last
3-4 months the only unmarred areas of these mats is in the 3-4
inche area right in the middle of the mats.
It's starting to get VERY expensive to keep replacing my mats
so often.
If your wondering YES I do tons of cutting.