I have a 12x12 Olfa rotating mat. I put it on my Xmas list a couple years ago. I love it for when I am making flying geese blocks and squaring up blocks, especially. The BOM I am doing this year has bunches of little template pieces...it is nice when I am cutting them out, as well. I know they are pricey but once you have used one, you will be very glad you have it!