I did it 2002. Definitely worth the money. you have to keep working at it every day in the beginning, and you probably will feel like a robot but with practice and dedication you will succeed to something like an eloquent speaker, i.e. a person in control of their stammer. watch the school for stammerers videos on youtube for some good indications. and mushsraf found his voice. costal breathing on its own may help, but if you get it wrong you may think the program doesn't work. it does work. it's not just about the breathing, but overcoming the mental blocks about speaking and facing difficult speaking situations. I hated asking people for directions and saying the letter b. on the day 3 of the course I asked 50 strangers the way to the bank. I'm happy to talk more if you want to message me with more questions. I'm independent from the program. good luck.