It is not a quilting toy or gadget it is a safety tool. I bought one of each size when I saw them online some years ago. I had a cutter slip and go over my ruler and if I didn't have this on my ruler I know it would have been one bad accident. The added bonus of keeping the fabric perfectly in line is great. I've posted before about how important this tool is and always get the same replies of it's too expensive, it is just another gadget. I hope no one gets a bad cut from a rotary cutter but it's likely to happen then not.