I by no means intend to insult the artists used in this book, but the standard of a lot of work included as examples is incredibly amateur looking in comparison to most other digital art tutorial books on the market. Not only that, but the book says it covers 2D and 3D art, when in fact about 10 pages cover 2D work, meaning its pointless for any 2D artists out there wishing to learn any techniques.
Also the rest, covering 3D is poorly presented, in such that it doesn't really teach you anything about modelling. As a reference for beginners it's pointless, it wont teach you anything in nearly enough detail. It'd be a lot better to get books focusing on 3D modelling, regardless of whether they cover sci-fi designs. And for anyone who's progressed beyond a beginner level, you'll find it far too basic to teach you anything productive.
The one thing it really covers is composition, setting up a scene.
I'd advise against this book, as I was very disappointed being an avid sci-fi fan and games design graduate.
It's a huge shame, as I was hoping this would be a perfect book for me (and sci-fi designers and artists alike)