I prefer Fiskars, have several styles of them. As a gift, I gave a leftie new quilter the Martelli ergonomic one for left handed quilters. Several years later, I heard her tell someone she never could use it comfortably. She was also new to sewing and being taught by her mother-in-law and always used her expensive olfa cutter. There is a difference in how you hold each one. I bought the 28mm cutter after Sharlene Jorgenson recommended the 28 mm cutter for small circles & curves.