Rating: - A MUST
If I were to be deprived of all the trading books in my collection but one, that would be The Encyclopedia. Unlike other literature on the patterns, in this book you will not find clauses like "most of the time", "usually", "seldom". All the information as it's related to the pattern trading is thoroughly backtested.
Few words about the author are due here. I do not believe you will find more ethical individual in the trading community than Mr. Bulkowski is. Unlike others who use their books as an advertising medium to lure you into subscription to their services and seminars, the author simply does not do that. His web site is FREE and he sells nothing but his book.
I can't even say that this book is highly recommended or you should buy this book... Nothing like that. I believe you owe yourself having this book on your desk 24/7 if you are to trade chart patterns. If you do not trade chart patterns then... you should not trade at all as all the "indicators" are nothing but derivatives of the price and volume behavior. Turn of all that noise and focus on patterns and volume and that's what this book is teaching you to do.

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Rating: - Dictionary for good
This book is just like a dictionary that you can always turn to whenever you have unfamiliar words in the stock markets. It's a good company that you can keep by you side and frequently flip to pages of charts which you are foreign to.

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Rating: - a complete guide to all pattern
without doubt this book is a complete cyclopedia of chart patterns but some parts are so streched .

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Rating: - The Bible!
Save yourself at least a year of back testing strategies using tradestation and collecting statistics.

This book is an encyclopedia, not a "psychological" trading type book. This is dry and technical information, statistics, numbers, etc. I wouldnt have it any other way. Make sure you have a trading platform that will allow you to put this information to good work.

This book is a must.

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Rating: - A Great Book for All Traders and Technicians
Mr. Bulkowski has done the leg work for all of us that don't like to backtest yet like to know the odds. Even if you backtest your own systems, it is very hard to backtest patterns like these. I have found it very helpful in my understanding of what makes a good pattern as well. Bulkowski's work will help you filter through the patterns to find the "best" triangle, or broadening top, or other pattern listed in the text whichever the case maybe. I have a pretty extensive library of trading books since putting on my first trade in 1995. The Encyclopedia of Chart Patterns is always close to my computer. I find it reassuring to double check the pattern I am thinking about trading. This book has helped me make more money.