There's some revealing information inside, such as Hubbard's spiralling manic-depressive emotional state, the use of drugs on himself/family and the resentment he felt towards his son due to Quentin's homosexuality (eventually causing suicide). Also, the political repercussions to L Ron's actions as Scientology's leader - especially legally in Europe, is an important history to the world's largest (and most farcical) cult.
A controversial public figure, many details of his life are subjects of contention. The Church of Scientology has produced numerous official biographies which present Hubbard's character and his multi-faceted accomplishments in an exalted light. Biographies of Hubbard by independent journalists and accounts by former scientologists paint a much darker picture of Hubbard and in many cases contradict the material presented by the Church.