I thought it was bloody brilliant! Before reading the book I wouldn't have classed myself as a metal fan but having realised the breadth of the genre, from this book, I'm certainly more willing to explore the 'metal' category. Having seen the conversation this has sparked in the 'Half a ton of heavy metal' Facebook group highlights the extensive research by the author while still keeping it interesting for somebody who may not be aware of many of the bands or sub genres. I'd highly recommend this book to anyone with an interest in music history, particularly metal. An absolute page turner that I'd worked through in just a few evenings.