I have used this on and off for a long time and it certainly does the business, but it's important to understand that the whole hypnosis thing only works if you allow yourself to relax and go with it. It's not a magical thing where you switch the cd on and suddenly you are in a trance. If you listen attentively thinking 'why isn't anything happening yet?' then it simply won't work. It's like lying awake in bed constantly asking yourself 'why aren't I asleep yet?'.
It won't be for everyone because to a certain extent you have to be able to get your mind in a relaxed enough state by yourself to begin with in order for the hypnosis to start working, but if you can just allow yourself to switch off and do keep listening to it every day for a month then you will notice real improvements. I was very skeptical at first and it took a while to allow myself to get into it but it was certainly worth it. If you're worrying about trying to make out every word he says though or are worrying what to do when you count down to zero then you're in the wrong state of mind for it to work to begin with. You really do just have to empty your mind and let it drift over you.