On the recommendation of a friend, who in retrospect was a total freaking weirdo, I attempted to read the Mission Earth series by Hubbard.
It was pretty crap.
A bunch of us were also once grabbed by the Scientologists, aged about 16, and put through their questionnaire - they have a "church" in Manchester from which they'd ambush young people and offer to give them a 'personality test'. Clearly, we all failed, as they subsequently showed absolutely no interest in me or any of my friends.