Just wanted to say that I thought my blades were going dull really fast and I have a good mat. Turns out my cutting table (one of those white ones like Walmart, Costco, Sam's, etc) has a slight bow when I push down. So I put an extra piece of cabinet we had left from an IKEA kitchen. I'm sure any solid piece would do, over the white table, mat on that, and lo and behold, my blades all last a lot longer with less pushing. I mostly use a 45 mm. although I carry my 28 mm. with me too.