I have had my hands on Larry's course before and I think that it is probably one of the better ones out there. Like ALL of the guru courses you adopt some of the materials for your use and abandon some. His had a lot of content instead of *fluff* which I sure appreciate. I learned a few ideas from him and would recommend his materials to someone who is new to investing.
As far as knowing anyone who has been successful using guru stuff ... I have known dozens who are successful and started with a course. It almost always develops, integrating their own style and personality into their investment business but non the less they started with a course. That said I know hundreds of people who have purchased multiple courses and have never bought a thing. Sad really. At some point you have to have the guts to jump off that cliff and do it, most sadly are bound by fear. No real estate course I have found can change the moxie of a person.
Hope this helps.