Hi...I don't have any Martelli cutters..BUT I have 4 Olfa cutters ranging in size from 18 to 60mm. I found them at JoAnn's & each purchase on line I used 50% off coupon. They are ergonamonic(sp). I absolutely love them as I have no feeling in ring or pinkie fingers on both hands. Easy curved handles and the blades close so much easier that the other Olfas. These are the way to go for me. Just my opinion.