Many guild members kept telling me I didn't need the quarter ruler, no use buying one. (I should have asked how they knew since if they didn't have one) I took a class from Carol Doak and my paper piecing was transformed! The ruler is necessary for me. No more miss cuts and my seams are all the same. I learned not to listen to others about new quilting tools when they don't have them to know if they are worth it or not. I have all of the sizes of them and I can say they are worth it and necessary when I paper piece.