I picked up the second edition of this book in my local library after having taken a 'taster session' at my local climbing facility and appreciated the book so much, I'm now purchasing this updated edition so that I'll always have a copy of my own. The clarity of his explanations along with the photos & illustrations accompanying them does a terrific job of explaining the moves along with where and how to use them.
But aside from all the technical need to knows, he also does really well on providing the etiquette as well as reiterating safety tips, which I think often doesn't get enough mention in an 'extreme' sport. Plus he has a very friendly 'voice' to his writing style, you can imagine him standing there saying as much to you as your climbing partner.