No offence, but I have always been quite wary of stuff like this. You say no one knows why people stutter, but hasn't it been proved recently that people who stutter have restricted blood flow to part of the brain? I have always assumed stuttering was related to something neurological. If that is the case, which I am pretty sure it is, I think speaking methods etc can only do so much. I think only a drug or something would actually 100% get rid of a stuter.