The book is wonderful. I've skimmed the Numerology section, but it's something that will never permeate my brain and so I'll have to have that one to hand if I want to use numbers in readings with this deck. But the section that has all the cross-referenced symbols is just fantastic!!! I wish every deck had this! It brings out the links between cards, it makes me notice things that I wouldn't have otherwise, and also it's taught me about symbols that I didn't know about before. I had been so curious about the many and varied symbols scattered throughout the artwork, and it frustrated me that I had no idea what some of them were (the alchemical ones especially escaped me). But now I have so much more depth to work with in this deck.
The book is huge, people. It's printed on A4 paper, not usual book size, and, yes, it's 151 pages. Trust me, it's more than you'll want, and when you get the book, you'll look at it, thinking, "How am I ever going to read this???" It's worth it.