Hi,
I have both of her rulers. I haven't done any of her patterns but it sure works well for doing square in a square. I hate cutting triangles. While I hate to waste fabric I really need to use up some of my stash. I have made two bed size quilts using the square in a square method. One is currently on my bed and the other I will be finished quilting within a week or so. I have also used it successfully in making several Linus quilts.