I remember when I first started the journey of understanding - understanding of what Reiki really is. I've been trained in the art of Western Reiki. Still, while my teacher implemented some New Age techniques into his classes, he taught the real history of Reiki from a Buddhist perspective. Yet for me, it was not enough. Years later, through reading and learning, I learned about traditional techniques and greater understanding behind Reiki.
And recently, I've read over "The Reiki Sourcebook" - my only comment is that I wish I read it few years earlier. I wouldn't have to seek answers on my own, as they are all provided by the book in question. It's a very informative reference work for those who wish to learn what Reiki is beyond the hand-on-healing technique.
Still, I can't rate it as 5/5, for two reasons. First, the book isn't trilling to me. Almost everything the authors included in this work was already familiar to me. This won't be an issue to completely fresh readers, of course :).
Second, some content seems to be a "copy-and-paste", the phrases repeat themselves from time to time, but not too often. Still, for someone like me, it's something that should never occur in a book.
But in the end: a lot of information and a greater, deeper meaning of Reiki practice, and the explanations of traditional and non-traditional techniques supported with illustrations, along with additional resources, directories, glossary of terms make this book one of the most valuable tomes in my library.