I haven’t done a course of theirs, but actually they have a self help book called “Beyond Stammering: The McGuire Program for getting good at the Sport of Speaking”. It costs about 10 dollars on Amazon and you can have it downloaded on to your Amazon Kindle app in just a few minutes. You can spend a few months going through the book before you take a course if you’d like. I have been using the book for the past few months and so would say it is a great program, and is wholistic, focusing on building a more powerful speaking personality, and also on a breathing technique. One thing I can say is that the breathing helps, but you can’t fully rely on it. You have to build up confidence in your stuttering by self disclosing. And a quick tip for the breathing that I’ve found is that in the most feared situations or words, you must commit to speaking at the top of the breath or it won’t be as effective. All in all, I would recommend it. No promises for complete recovery, but here is a great video where a man, in over a few years, pretty much completely recovered using the McGuire Program.