Pretty much this. I'm an SLP specializing in stuttering and I pretty consistently see clients who have been through HCRI in the past, yet still decide they want more therapy a few/many years later. Some are mild, some are severe. It's intensive and the techniques are solid, but it requires discipline and commitment to keep up the level of practice such that you maintain the gains from using the approach they teach you. As the above poster stated, the effort required may not be worth it for everyone. Their statistics are a little misleading, IMO. They take measures immediately pre- and post-treatment, and the measures are taken in laboratory conditions (the highly controlled environment of the program). Which is fine, but does not account for how your speech performance will be once you step outside and back into real life. This is the nature of speech therapy-- whether it's intensive or just regular weekly therapy, it is very easy to be fluent in your session. That said, I've heard plenty of anecdotal stories of people who attribute positive, long-lasting changes in their speech to their time at HCRI. It all comes down to the individual. People respond differently to different treatments, there is no "one size fits all", so you won't know if something works for you until you try it. Which is a bit tricky for these intensive programs because they are a big commitment!