I first encountered this group 25 years ago when they were called Forum. My sister had become heavily involved and had recruited me to help with the catering for an event she was organising in connection with the course she was doing at the time (there were many, each one followed by the suggestion / recommendation from a "mentor" to do another at great expense).
Anyway, I remember being set upon by a particularly predatory "leader", who in all earnest suggested that if I was committed enough to making the most of my life (aged 17...), I should follow that conviction and have the integrity to do it; she encouraged me to drop out of college and work shifts at cleaning and babysitting to make money to pay for courses in their program. My objections were met with eye rolling and further encouragement not to fall into the trap of making excuses for bailing out on my true purpose. It was such an unpleasant experience for me as a young kid, and sadly my sister was too brainwashed to intervene.
My sister spent a couple of years with them on a roller coaster of busting a gut making money for courses, devising "games" or projects to pursue which usually involved moving heaven and earth and guilt-tripping other people in to helping her, not to mention the never-ending recruitment / enrolment drives. Yawn. She then spent twice that long in therapy to try to reconcile the experience and understand what had happened to her.
Since then, I have bumped up against the same group a few times (and always with an agenda of recruitment along with enraptured, strangely scripted "testimony"), and yes, received the early morning phone call from an acquaintance who needed to tell me that she was ready to take responsibility for the fact that she had been sleeping with my then boyfriend and that she wasn't proud of the fact, but was now ready to make peace with it. Good for you!
This person has since, through a great stroke of irony, come to be a close friend (water under the bridge, and all that), and we have talked about her experiences with the organisation. She became quite a star within it but has since dropped out and has described how, despite the endless talk of integrity, she ended up feeling exhausted and as if that same integrity had been compromised.
To me, I would say that unless you really want to alienate your family and piss your friends off, you can achieve great results in personal growth or is it personality with the help of a genuine and compassionate therapist, a wise coach and a steady meditation practice.
So yeah, avoid.