I began scratching two years ago using this book, and progressed faster through the basics than any of my friends who started at about the same time. Now I use this book to teach others. It breaks things down into easy to follow and clear descriptions, something that no video I own bothers to do.
The interviews are also dope; QBert, Swamp, Mixmaster Mike, Craze, Atrac, and Kuttin Kandi all have interesting stories to tell.
There is also a short history of the hip-hop DJ, which is stuff everyone should know if you're going to DJ.
The two pieces of vinyl that come with the book have some great samples for scratching and two cuts for beatmatching.
I especially enjoy teaching with this book, it makes it easy for my students to make progress between lessons. It also includes some traditional music notation, which gives me a clear vocabulary to talk to my students with.
If you're starting out this book is excellent.
It works!