I was given this book 20 years ago, long before I commenced my BF training. I am now a Bach Flower Remedies Practitioner, and this is the book I rate most highly, for psychological insights into the Bach Remedies. I teach the use of the remedies to former addicts, and have recommended this book to dozens of them. There is sufficient psychological depth without the dryness or old-fashioned language of some of the other books on BFRs.
One word of warning: several years ago, Amazon suggested that i should buy this book with the Illustrated Encyclopedia of Bach Flower Remedies by the same author. I did, but found that the main text is the same, with some minimal updating of the language! The encyclopedia is a much bigger book, with beautiful colour photograpy, and additional "how-to-choose your remedies" pages, but you really don't need both books unless you want the same text twice.