I loved two things about this book: If you want to know everything about the Black Sabbath career, including the bad stuff (which I did), it's in here. All the lineup changes, the singers, the drummers, the 80's, the coke... you got it. Descriptions of the recording sessions, comments from each band member on what each song is about. Lots of good stuff from Dio. If you want to read stories about Ozzy being wasted and pissing on things, read HIS book. This is the lonely quest of Saint Anthony Iommi.
The other thing I loved about this book is that it comes with a mind blowing collection of illustrations, mostly of rare and obscure Sabbath records and merchandise! I can't believe how much there is! Causes fevered dreams for the collector nerd.