I have multiple brands of 45 mm cutters (Olfa, Fiskers, Clover, "no name"), two Olfa yellow straight 28 mm cutters, one Fiskers straight 28 mm cutter and one Olfa 18 mm straight cutter. My go to is the Olfa 28 mm cutters. I find the 45 mm too large and cumbersome to use. I have tried a 60 mm cutter once...no thanks, too unwieldy for me. I don't care for the ergonomic cutters as they feel awkward in my hand. I haven't tried the Martelli, have heard good and bad about them. For the money, I'll stay with my straight Olfa cutters.