I would recommend this book to anyone who already have some experience in lucid dreaming, but are looking to take it to the next level. Waggoner - an experienced lucid dreamer - writes passionately of his interactions with the subconscious, based on his own experiences.
The book is well-written, and discusses both various ideas in psychology as well as more practical guidelines for the reader. All based on past experiences. I have tried a few of the ideas myself, like self-healing. It works, but interestingly, the experience is never exactly like in his dreams, underlining one of his major points - the subconscious never stop bypassing your expectations.