This is a great book for the right person, but let's be clear on what it does: It helps you take the .PDF files you export from your CAD program and import them into Photoshop or Illustrator to render them for presentation. It also walks you through using Sketch-up and 3D Max to create perspective or 3-D style renderings.
This is not for the average design-build contractor who wants to add a little spice to his or her drawings, because all of the techniques outlined assume you want to spend a decent amount of time tinkering with the plans. If you need some drag n drop or fast click color, I'd suggest using Dynascape with the color module or one of the other CAD-based programs that do that for you fairly simply. It's definitely not a book for homeowners.
Instead, this is for architects or designers who have enough budget in their project to allow for spending 4-8 hours or more creating colored digital renderings for presentation. This book assumes you're working with a CAD program and have the adobe suite of products, including Photoshop and illustrator. If you have both a CAD program and Photoshop at least, then this book will take you through the basic Photoshop activities you need to do to render your project for presentation without using those stinky chartpak markers.
If you are already proficient at Photoshop, this book won't teach you much that is new. The section on Sketch-up and 3D Max are small and fairly basic. But if you have gotten Photoshop and just aren't quite sure how to get started using it for this kind of rendering, then this will walk you through it perfectly.
The question you'll want to ask yourself is: "Do I want to learn ALL about Photoshop, or only how to render landscape plans in Photoshop?" If the answer to that is the second, then this book is exactly what you need. It does a great job of showing exactly how to do that. But if you want to learn Photoshop properly, then the techniques in this book aren't so specialized that a non-specific but thorough book on Photoshop wouldn't cover it. The strength of this book is that it is SO specific in showing exactly this one kind of rendering work and how to do every element of it.
This is a textbook format book and as such is hard to sit down and read for a stretch. Many books nowadays that are instructive take a more casual tone and don't bother stating things that should be obvious like textbooks often start out by doing. But the benefit of this textbook style of writing is that the authors are very thorough and take you through every action step by step. They have provided tons of screenshots and pictures of exactly what the menus look like and what your rendered drawings should look like at each stage. It's a very thorough book and if this is the kind of help you need, you won't regret buying this book.