I was given a Martelli rotary cutter as a birthday present. I love the feel of the ergonomic cutter in my hands, and it helps because I have nerve damage in my hands and arms. I'm still on the first blade I put in 4 months ago, it's still as sharp as new, and I have no idea when I'll have to change it. Obviously, I'm loving it! I used to use Olfa, and thought they were really nice, but Martelli is better. IMHO.