I used it. Its very informative, I loved the words of van-riper. They are kind of like my greek sages for stuttering philosophy. If you believe their words you will be adopting a much more powerful mindset about your speech. That said, I PERSONALLY didn't like doing the techniques because I dont really want CONTROL of my speech, I want to be able to speak without effort or trouble. so I decided it wasn't for me. but like I said, just reading it is very helpful.