I have the long binding ruler with the 45 mitered end. I use the 2 1/2" wide binding ruler to accurately cut bias binding. After you have done the joins a few times, they become much easier. I don't know if I would have used that cute little square looking one more than two or three times. It probably would save me 5 minutes, but I'm okay with that extra 5 minutes of time matching the ends up. I am going to try the method of measuring based on the binding width. I think that will save me the 5 minutes.