I think the CD a useful extra to your diet plan. Not sure how often supposed to listen to it !
The book is useful for focussing on how hungry you actually feel and taking more notice of what you actually eat, rather than wolfing it down without paying attention to hunger levels or how full you feel.
I have used it and really got on with it well.. however you need to stick at it (obviously..) for it to work long term... I find that if I don't read book/listen to CD I have slip out of the good messages that do work -- I lost about 7lb when I used it --- I like it as you can eat any food -- just obviously in controlled portions - it has made be think differently about food -- and that is a good thing that no other diet has achieved!
Haven't read this or anything but did get hypnotised to lose weight years ago. That was based on just getting you to eat three meals a day with no snacking at all and if you were hungry to eat but to take time to think whether you really were hungry before you did etc. I used these principles a few years ago again and lost nearly 3 stone. There's no need to do funny diets etc - just eat three meals a day and stop when you are full and you lose it! I called it my eating like a thin person diet!!