This was the first audio tape of Tony that I bought. Well, the way Tony gives seminar is really admirable- he's really energetic, funny, congruent, and he gets his points across effectively. Most of the section is recorded from his real seminar, and it's great! However this version is a little bit too short, maybe it's Simon & Shcuster's fault cos they always release such short audios. There's another version of Unlimited Power, it has 6 cassettes, it;s a fuller versions with lots of NLP skills. That version is released by Nightangale-Conant if I'm not mistaken. I listen to that 6 tape sets every now and then. The format is very similar to this tape, with Tony in studio and seminars teaching you the skills, but this version is only about 50 mins long.