I've played mage for a few years now, before third edition graced the shelves, and I found that this book was not terribly helpful. While it had several high points, the extra skills included on a whole could be gained by taking a specialty in an already listed skill. The merit and flaw section was interesting, with the publication of revised and third edition, it's no longer needed. The expanded tradition sections, were helpful, but sense the publication of third edition, they are no longer up to date and to be honest, if you want to know about traditions The Traditions Gathered set of books is a far better resource. While The Book of shadows is an interesting read, it's definitely not a required resource for mage.