I love the Martelli rotary cutters. Maybe it's because both thumbs are/were 'double' jointed & now they don't like bending at all cause. It USED to be fun to amaze children with how I could bend them to impossible positions. NOW I'm paying for it.
I tried them at the 1st show where I saw them, & immediately bought one plus extra blades - GREAT introductory price back then, especially on the blades.