I did it almost a decade ago. It was great, and really helped me at the time. I went from being unable to speak, constant blocks that would give me migraines. To someone who could speak with confidence. Even if it means stuttering confidently on purpose. I will say though, it does take a lot of work, it’s difficult. It’s physically and mentally exhausting especially your first course. It was very emotional for me. That said, I don’t keep up with the directions of the program anymore as much. But I do notice myself sinking back into the techniques I learned there if I’m in a speaking situation with pressure. I think the reason it worked for me is that it was my last resort, quite literally. I put my heart and soul into it for the first year, really “practicing the sport of speaking”. Keeping up with it all. If anything, it’s fun, it opens you up to the realisation that confidence and stuttering can exist together.