So far I really do like it. I read that alot of women who had done hypnobirthing classes had supplemented by buying hbabies discs and if you look on ebay, the course sells for quite close to what they originally cost so I have just not written in mine and may keep it for my next birth then sell it after. they come out w new format every so often but the scripts are pretty much the same so even if you get the fifth edition on ebay it would still work, you just probably couldn't sell it for as much. I will say it takes at least six weeks to do the course and have time to practice and get the cues ingrained in your mind. Also its helpful to have a partner who is willing to read scripts for you and be involved and you need to listen to your CD's for about 30 min each day. If you can't put in the time, it just wouldn't help you.
there is also a certain amount of "acceptance" that goes into it. You have to accept that the techniques they teach you work and choose not to override them. You have to practice like you are supposed to. If you are the kind of person who might listen to the CD and think "This is such a crock. Of course I can still move when my "lightswitch" is off!" then you may be too literal minded to really benifit. The relaxation is key. It takes a certain suspension of reality, then the more you do it, the easier it becomes to feel yourself slip into hypnosis. And don't plan on listening to scripts in the car or you may fall asleep and wreck!