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Rating  - Amazing book
This book uses an easy way to explain system patterns. I think every software developer has to read this book; it's a nice reference to help software architects doing a well-done job. Another great reference that you may have in your list of references is the classical book "Design Pattern", also at Amazon.com.
Rating - #2 best book about patterns ? yes.
A lot of the reviewers have said that this is the #2 best book about patterns : just trust them. I have bought it with the hope to learn more about patterns, finally it has given me a larger point of view about the subject and has improved a lot my creativity during software designing processes.
If your new to patterns just read the GoF, then buy this one. I think you will then have a nice knowledge about the subject.
Rating - The second best pattern book
Second best isn't bad when the #1 book changed forever the way software architecture is talked about. GoF is not only well-written, but it covers all the basic, most-used patterns. Everybody thereafter is going to have to either re-hash GoF, criticize it, or come up with new patterns which are not as fundamental.
This book is full of new patterns, and fortunately they are good ones: Command, Broker, Layers and worth the price of the book in itself Presentation-Abstraction-Controller.
PAC can be seen as a generalization and extension of Model/View/Controller. The Abstraction is the domain-specific part of the architecture, effectively the Model. The Presentation exposes the Model in some interesting way, either as a user-interface in which case it is a View, or as an API, in which case the Presentation becomes a new Abstraction used by the next level up. The Controller is left with the job of coordinating the Presentation and the Model. The key to the pattern is that PAC agents can be built up into layers with the Presentation API of each lower agent creating a higher abstraction for the next level. Thus PAC becomes MVC for all or your architecture, not just the UI.
The book goes into this at length and adds useful discussion of MVC. Highly recommended.
Rating  - Not concrete enough
First of all, you need to understand the patterns in the gang of four book before you attempt to read this one. They talk about them all over the place without explaining them. That's a warning, it didn't affect my review.
The major thing I don't like about this book is the abstractness with which they talk. They give you a high level description of a pattern and leave you with that fogginess.
I think the examples were poorly chosen. I would have prefered to have examples that are only as complicated as they needed to be. Unfortunately the book uses examples like, "We're going to make a voice recognition application" or "We're going to make an OS that can run applications that were built on Unix or WinNT or Linux". I think the intent was to have some real-world-I've-been-working-for-six-years examples... it would have been smarter to put the real world examples in a separate chapter and keep the design pattern explanations simple.
Also, I hate the diagrams. They should have just copied the diagrams in the GoF book! Instead they chose these diagrams that give less info and IMO are downright ambiguous in some situations. Another thing the GoF book does is have 2 separate diagrams, one that's a (simple) real world example and another that's a diagram of the actual pattern. This book only has the diagram of the actual pattern.
I disagree with those that say this book is better than the GoF book. I think what they like is the material covered. Material aside, the GoF book presents the information in a much clearer way. That's why I prefer the GoF book over this one.
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