I've heard a lot of other reviewers say that this books needs to be updated, but anyone with a brain can figure out how to add in electronics, etc. to the program.
There was only part I didn't like and that was that Farber's use of mnemonics, simply for the fact that they don't work for ME. Mnemonics work for thousands of people, but I am blessed with the ability to just look at a word and remember, and the stories that mnemonics provide tend to just get in my way. However, I understand how much this method will help some people and that's why I say you should use this method if it is effective for you.
Overall, this book is something you should definitely get if you want to learn any language. It's worth the relatively small amount of money, and you will learn a wealth of information from this book.
The book is divided into three parts: Part I is a lengthy (but very enjoyable) presentation of Farber's own story (and how he came to speak over 18 languages); Part II is the meat of the book, the actual system. This section contains the raw information needed to be successful at learning any language, which Farber himself concedes is the end result of years of poor decision-making, coupled with some very insightful (and at times accidental) choices, in the end distilled into the most helpful techniques. While some would claim that nothing here is revolutionary, I would like to add that nothing here hurts either! It's often important to find reinforcement of one's own arrived-upon ideas, and also to receive a new perspective on why something is the way it is. Part III is a small group of appendixes that mention the now unheard of (I can't find it!) Language Club in New York City, a list of the world's major languages, and also Farber's own notes (reviews, really) on the major languages (European and Asian).
If you've read this far, please do yourself a favor and get this book. The only reason I've cared to write so much about this book is because it really meant a lot to me to find this book when I was debating whether or not to spend the time, energy, and money to learn another language. I hope this book will help guide you to your destination, just as it's helped guide me to mine. Good luck!