I have numerous rotary cutters. Just bought the Martelli one and was given another when I bought one of their cutting tables. I have 4 or 5 45mm..one or two 24mm, one 18mm and one 60mm. The one I love the most is my 60mm Olfa. I would be totally lost without it. I use it if I'm cutting several layers or one. Once in a while I need to use something smaller if trying to cut tight places but I always go back to my 60mm. Once I got use to it..nothing will take it's place.