I'm just going from personal experience being a very, very severe stutterer talking to others who have the same problems. Right, so I went to this course. 16 people attended, and all 16 people had drastic changes during the course and their final product was amazing, life changing even. Now, going off of this, using it like a case study, 100% of the people could speak in front of 150 people, with confidence and in 100% control. So what I'm saying is, if it doesn't work for them, personally, I can't find any other reasons to why it wouldn't work other than what's stated above, or the odd exception. And for your second point, I'm just going off of person opinion of the course, and from what I've seen with other people, how it's affected their lives. That's human nature isn't it, being proud of something that's DRASTICALLY, changed your life, no? Taking into account what I said above this paragraph, from personal studies, this is what I see. Feel free to bring counter evidence to the table, in which I see none of, all I see is what I've experienced. Sorry if I may of offended you in anyway, and I didn't mean it to come across as 'pushing it down your throat' type of post.