One of cousin kept going to the intro sessions but he never signed up. One time I invited him to another intro session, and he was "yeah... I think it's time to go to another one". I was like "hunh??". Turns out he was getting enough value out of the intro sessions, that he didn't see the need to actually sign up. I suggested that, if he was getting that much out of 3 hours, how much would he get out of the whole weekend?
On the sunday of the course, he was like: "How come you didn't make me sign up sooner?"
The vast majority of people who actually take (and complete) the course find it very worthwhile. About the worst review I'v gotten was "It's the best thing I've ever done in my life, but I'm not going to do it again". Since the crux of the course is in the last few hours, people who leave in the middle, may be a bit wierded out about the purpose of the whole thing.
Bottom line, I'd say 'do it'. If you haven't been to an intro, at least go to one, then decide for yourself. If you have any more questions, I'm thinking a private email might be a bit better (( bcgreen.com!spamuel , if you understand the old usenet email protocol )), but either location's fine with me.
Now there's this Journal entry where we can chat 'in private', so to speak.