I bought the 60mm and 45mm martelli cutters. After 1 project the 60mm already had nicks in the blade even though I was very careful with it. So I'm using the 45mm now until it's nicked and then I'll spring for new blades. I like the design of the martelli but I'm not impressed with the short blade life I got. I'm glad to know I can use non martelli brand blades in them.