Easy onset, baby. I wouldn’t go so far as to call it a cure, but I don’t stutter when I use it. One of the most mind-blowing exercises in speech therapy was this: Talk as slow as you need to so that you don’t stutter. Eeeeeeeeeeeven iiiiiiiiiiiiif iiiiiiiiiiiit ssssssssssounds lllllllllike thhhhhhhhhis. Just set a baseline, a speaking rate in which you have total control. Then slowly speed up from there.