I have quite a few rulers, and a few templates. I love the tumbler shape template. I have actually 3 of them, a mini, one that fits a 5" charm square, and one that is even larger. The more specialty rulers are helpful, but I wouldn't buy them until you are sure you need one. The most useful would be the triangle rulers, and the Tri-recs rulers. If it is something you are only going to use once, maybe see if you could borrow from someone, or try to find a way to make your own.