I have an Olfa 24"X36" and a Martinelli 36"X72" mat. I use the Martelli more often since it is larger. I like that I have space for two separate projects on it. I am usually working on both a charity quilt and a personal quilt at the same time so it is easier for me to stay organized. Plus, since it is 6' long, it is so much easier to cut the quilt down before binding since you don't often have to move the quilt, just your ruler. I waited for the 50% off sale. I give my mats a vinegar bath 2-3X a year. I don't know if it helps, but I figure it can't hurt since I don't wipe down on the in between.