I have a smaller one, the 45 mm, the 45 mm pinking shear blade one, and 2 60 mm ones. I love the 60 mm one from Olfa - it's their curved handle one. My girls bought me the Martelli for Christmas along with the blades (Very expensive). I use the 60 mm almost exclusively. Since I switched from the 45 mm size to the 60mm size, I just don't like the 45mm one. Now if I can't find the 60 mm, I do use the 45 mm and also if I'm cutting small pieces and sizes, I do use the 45mm one for better control. Haven't test driven the Martelli yet but am thinking about playing with it today after I get going on some laundry.