If you are trying to learn how to yo-yo FOR THE FIRST TIME, then this is a good book for you. Advanced spinners shouldn't consider this book at all (if you know what a lindy loop is, you're advanced). I've mastered tricks like atom smasher and barrel rolls and am now working on pop-up tricks and I find this book almost common sense. if you can do braintwisters and other tricks of that level, there isn't much for you to learn from this book.
This book is a good one for beginners, offering basic tricks, tips, and history. Unfortunately, most beginners aren't serious enough about yo-yoing to buy a book. If you can't do a braintwister, this is a good buy; if you can, learn tougher tricks from websites like Cosmic Yo-Yo, 3D Smarty Pants, and Sector Y.
In conclusion, first timers should get this book, but spin masters shouldn't.