I bought the twister ruler, but have not used it. I bought it in aticipation of a class I was taking with my guild. We ended up using a "twister" ruler by Marti Michelle, that gives you the same results, but works differently. From what I understand, Marti's ruler works better than the original twister, because you don't have to create a top and then cut it apart. Her ruler allows you to cut the four different peices from the one ruler, and the she has a pattern to put it all together. Once I figured it out, I had fun with it. I also allows you to cut 8 sizes with the same ruler. It's called Tessellating Windmills. Gina