The only flaw in the edition of Tarot of Ceremonial Magick that I received was that under KEY XVII Star is a duplicate of the image KEY XVI Tower, although all the information was for KEY XVII Star.
If one seriously studies the Tarot, like anything else, it will start to release its secrets. This is an excellent book for allowing the limits of the Tarot to be expanded in multiple directions as well as diminsions. That doesn't mean one has to be into the I Ching, Enochian, or Alexister Crowley, though it does allow for a mention from these areas to act as a clue for further enlightenment.
While many newer Tarot books like to replace the standard understandings with their own philosophies, which may not be as proven or as sound, this book does the opposite and reaches to grasp more of the old tried and true teachings. I would recomment this book to the serious student.
I got the ceremonial magick deck before I got this companion book. Basicly it is a little more in depth information than what is given in the deck's instruction booklet. But the appendixes are filled with goetic magick and some other rituals. Overall, the book is a total rehash of the deck's instruction booklet and the appendix information is available elsewhere. But Duquette's deck, barring some simple artwork, is a good, accurate deck by a modern magician who knows what he's talking about. This book will be an aid to those who have the deck for it, but would be a lot better for someone who is new to reading tarot cards.