I'm new at quilting and cutting and the rotary cutter. I measured with the regular type rules , made paper templates and still couldn't get things to come out right. Then I saw these rulers/cutters at the LQS and bought the small one; read the instructions and practiced with it and followed the directions. I felt like I had struck gold! They are the best thing I have found and have since bought every size. I can't believe none of the "experienced quilters" I know told me nothing about them and when I asked them about the June Tailor cutters, most of them acted like I was from Mars. Their loss and my gain!!! You can cut strips in no time. I also have a Go-Cutter but not all of their dies which can get expensive.