I have three Olfas and use them all the time but I tried a Martelli at the Sewing Expo in Worchester MA this weekend and REALLY liked it. It was easy to use and less stressful on your hand (your hand "rests" on the top as you push forward rather than gripping the handle). Also the folks doing the demo claimed that the blades lasted longer (??? - or so they claimed).
I may have to add this to my ever growing Wish list. :roll: