I'm doing hypnobirthing and am quite enjoying it. I bought the book and the rainbow relaxation CD early in pregnancy and read the book. I listen to the CD of affirmations and relaxation multiple times a week, going to sleep.
Our class is a four session (2 hr each) class for $200 (which I think is a steal.) We happened to be the only ones who signed up for the class this go round so we are working directly with the teacher which is a huge blessing.
Throughout pregnancy I've been way more involved in birth planning and reading - I think this is natural. The class has been a helpful way to get DH involved. The class is an hour away one way, so not only do we have the sessions but we have the drives to and from to talk. It's been a good inspiration for him to get involved and now he's able to relax me deeply even without using scripts. Last night I was feeling crappy and disgruntled that I hadn't been able to get much done yesterday, just didn't feel up to it. He totally got me all snuggly and relaxed and sent me off to sleep quickly.
We are NOT really using the exercises in the book. We're using rainbow relaxation script revised and some photocopies out of hte book Mind over Labor which our teacher lent us. I'm really happy with the results and the price, but I believed in this method (partner led hypnosis/deep relaxation) from the beginning. We haven't gotten a ton of this is how labor works etc. We did a great fear release exercise last week. Hope that helps!