I went through the program whenever I was 16, I'm 19 now. It is a LOT of work and the 12 days are basically hell. I did see 'some' positive differences after the end of the program, but nothing close to life changing. Keep in mind this was directly after completion. My girlfriend u/krcherry did the program as well and I believe she commented on this post. She is a little more positive about it than I am. 3+ years later, I've realized that their approach is very flawed. They look at it purely as a muscle issue and that by learning to talk again, you can fix a stutter. It really is relearning how to talk. I have heard of people having positive results but they are very few and far between. If you do decide to try it and it does work out, great! It requires CONSTANT work though. The techniques will never feel natural. It doesn't matter how many times you try it, it will feel forced every time you talk with their techniques. I wholeheartedly believe that joining a stuttering support group will help infinitely more than 12 days at HCRI. As my gf said, accepting yourself and your speech is the most important part. - On a side note: If you do decide to go, everyone always gets sick a couple days in. Pack some DayQuil. You won't regret it.