There are two kinds of people who would most benefit from this book--composers who are professionals in Midi orchestration and teachers specializing in this subject. For novices, I offer this quote from the book, "It is no secret among those who arrange for both real and MIDI orchestra that it is far easier and less time-consuming to arrange for a real orchestra. In MIDI orchestration, you have to do twice the work."
The book breaks down the chapters by instrument classification (string, woodwind, etc.) then into later chapters of "Sequencing Techniques" by classification (for string, woodwind, etc.) It follows with mixing, creating mood, effects plug-ins, and so on to "achieve the goal of creating realistic reproduction of a symphony orchestra sound using samplers and computer recording techniques"--all this, by way of combining technical skills with musical artistry.
A specialized book, but I will say that the information on orchestral music and instruments/instrumentation in general made for interesting reading/review for the non-specialist. If you are "just" a serious hobbyist, I think this could also be an essential reference book, and probably would encourage "expanding the boundaries" of what you do/know/are comfortable with--always a good thing.
Oh, and the website referenced here, on this Amazon review page, works just fine.