Worst Unity book I've read so far, bad grammar make this book hard to understand even on simple task like drag-and-drop book asset to the game. Although this book is about scripting but I found code in the book contain error, and need check and re-check every time I write a code in Mono. Asset downloaded for this book also need many adjustment before you can use it in my project, for example the Robot model are lost it's texture. I think this book is now worth of your money, if you search for beginner book, go for Unity 3.x Game Development Essentials
it's the best book for beginner, and the book website provide updates for latest unity 4.x or if you want more advanced book Unity 3 Game Development Hotshot
are a good book to start.