I took a class and I'm not really fond of the method. There are rulers, books and other gadgets you purchase for this method. My main complaint is that the quilt is heavy, stiff, and thick. There is a lot of folding over edges and sewing and then refolding and sewing again. My hands were hurting before the class was over. I like the Quilt As You Go Method, also know as Reversible Quilts by Sharon Pederson. I took a class for that method and it was fast and easy and no special rulers were needed.
Rhonda