If the title of this book didn't clue you in : this guy thinks BIG. No, make that BIIIIG!
Mr. Savage presents a complete programme of technical innovation, starting with colonies at sea and then in orbit, and proceeding to a giant, galaxy-spanning human civilisation. These elements have all been presented before, individually, in both technical and fictional literature, but this is the first place I've seen anyone draw them all together into a single, relatively coherent path.
Now, I do think it's right to be skeptical about a lot of the technical specifics Mr. Savage discusses. I don't share the faith in OTECs that he has, I really doubt his belief that humans can tolerate a 20g acceleration for any protracted period, and I think he over-estimates the willingness of most people to spend their lives in zero-g, crouching inside hollow asteroids (however nicely planted) and munching on vatgrown algae.
Whatever you think of the technical feasibility of his programme, he does present some startling ideas, amongst which I particularly loved (I'm paraphrasing) "Mars is an ecosystem in kit form ... all it needs is a catalyst to spring into life - that catalyst is humanity". Mr. Savage also makes some observations based on the truly titanic human population he foresees - trillions of people living in each of thousands of inhabited systems - he calculates (statistically) that hundreds of exceptional Mozarts, Picassos and Einsteins will simultaneously be alive. Like I said, he thinks big, and reading this made me think a little bigger too - if nothing else, that's the real value in this book.
Mr. Savage has an unerring faith in both technology and humanity. His vision of the future is one of endless growth and boundless resource, but he confines himself to the 'how' of this - the 'why' he leaves to others. Some of the reviewers expressed concerns over the "white-people-in-space" aspect that one finds in much "utopian" literature - I really can't see any concrete evidence of that here. It doesn't seem either logical or fair to suppose that a treatise as optimistic and technocratic as this need necessarily subscribe to right-wing social theories - indeed the book is rather thin on the societal implications of the massive changes Mr. Savage predicts. That said, the people depicted in the book's few colour places do all appear caucasian, albeit with a bluish tinge :)
You don't need to believe this book, but I do think you should