I caught myself laughing out alone more than one time while reading this book. The short chapters format was a different path to go, but iw worked. One has to get used to it.
Iommi covers everything, all the albums, but of course the book had a maximum lenght, otherwise it becomes a little unviable in terms of marketing. He goes through his four marriages, the usual drugs and alcohol related tales, pranks and disasters, his childhood and family environment, a little about every album and band member that went through Sabbath (contraty to Ozzy's book, where Jake Lee and even Zakk Wylde are almost not mentioned at all), manager troubles, the technique adaptation need for playing after losing two of his fingertips, etc. He does so in a way that doesn't become boring. Or would people like to hear about another hangover, another session of coke consumption, another groupie "banged"? I think not.
The sincerity is also there. He clearly says about difficulties to play the same solo identically two times in a row, difficulty in crating faster songs, never tryuing to write lyrics, etc. (probably he left behind the part of losing some audition capability, because I watched the Heaven and Hell tour in 2009 and gohs, they were loud, really loud!!!)