This is a very worthwhile book for anyone interested in the history and development of the fast driving metal music called thrash. There is excellent and in-depth coverage of the leading bands of the movement, as well as hundreds of lesser known bands. As one would expect, Metallica, Anthrax, Slayer, and Megadeth receive very thourough treatment. I really enjoyed this part of the book. Finding historical information about Metallica isn't difficult, but to find such thorough coverage of Slayer was a real treat. I do however have two critical observations about the book. First, it was written by a New Zealander who, while obviously having tremendous passion and knowledge about the music, tends to take a very global view of the movement. Many readers may well consider this a great asset, and I admit that much of it is interesting. I however would have preferred to read more detailed coverage of the movement as it occured in the United States, exclusively. The book has many, many pages of obscure European bands that came and went without leaving much of a mark on the history of the movement. Again, many readers may delight in this sort of coverage, so if this is your thing, this book is for you. The other observation that I have is that the book is now somewhat dated. The most glaring example is the coverage of Pantera and Dimebag who was, of course, murdered while performing. The book pre-dates this ugly incident, and therefore makes no mention of it. Other important events have probably occured within the movement that would no doubt be included in an updated edition of the book. Despite these observations, I still recommend it as a well written and interesting book, worthy of inclusion in any Rock library.