I find this book much better than the second one, Nemesis, which is more about who fucked whom how many times and some far-reaching claims about killing Bobby Kennedy, and was obviously written to be as scandalous as possible long after all of the actors were dead and could not deny anything. (An interesting reading, nevertheless.)
This one concentrates on business methods and life philosophy of Ari, as well as provides complete timeline of his life. So, although it's a very sad life story, I would categorize it as a business book, and one of the most "plausible" I've read so far.