Let's get the two negatives out of the way. The book is twenty years old (I think the drip irrigation info is outdated now), and they're trying really hard to get you to buy detailed landscape blueprints from them.
The latter item is a mixed blessing, because it also means that they give you solid, detailed information on how to install a landscape because they'd like you to think of their plans as the one, last thing you need. General sketches of the plans are included in the book, and I found those really useful for thinking about how to lay out a space. I also appreciated that their plans look like something I might see in suburbia, and that they have ideas for how to scale them smaller and larger.
They also have some really great ideas for low-maintenance...like installing a ground cover that absorbs leaf litter so you don't have to rake it (brilliant!). I already have an idea of what plants I want to grow, so this book was very useful to me in figuring out how to put it all together. If I actually wanted a "Plant X, Y, and Z" kind of book, this would probably just be frustrating.