Yes - I did this stuff quite a few years ago & i've got friends who've done lots of this stuff as well.
- Yes - It came out of W Erhart's EST program.
Hmmm i have conflicting thoughts on this. Having done it - i got some benefits from it. Its brilliant in that it gives you some tools to approach life and i liked some of their 'definitions'.
It sucks in that they can be new age fascists (in my opinion) at times, and they get too caught up in their own stuff and loose their sense of humour. They can be a little intense, shall we say.
Unfortunately some people can get carried away with it all & it turns into their new 'religion' which ain't pretty!
Not cheap either - but maybe that's not a big deal
hope that helps (probably too late