When I found out the Pfaff 4.2 had the stop/start button I was disappointed that my Pfaff 4.0, didn't have one. But when I'm FMQing I set the speed control so that I have a consistent speed. I can press the peddle all the way down and it will still maintain the same speed. And I don't have to remove my hand from the fabric to push a button to stop. So I'm happy with my setup. But I do like all the gadgets on these new machines.