Haven't heard much of anything about TFP, care to fill me in?
I have heard some disturbing things about Regnum Christi, but only in regards to their boarding schools, from former students. (nothing of a sex abuse nature or anything but deliberate undermining of parents in a cultlike manner)
Then again, I have yet to see a truly successful Catholic boarding school. The few I have any experience with are truly awful, but I have had limited experience.
Rumours abound on the internet ... any search engine can help you find them. I speak only of my very limited experience of meeting them at the annual MFL. The best I can say is that their behaviour and demeanor reminds me of the "Moonies" and "Hare Krisnas" whom I occasionally encounter on The Mall or around Metro stations. The literature they hand out does not seem unorthodox ... I simply find they themselves to be extremely off-putting.