Eclipse, despite it's rather sensationalist title, and sensationalist opening, is very much an academic piece of work. The hypothetical introduction, wherein a new US President goes running cap in hand for an emergency loan from a Chinese appointed IMF Director, is really a prelude to what the book is primarily a study of, namely how a country achieves monetary dominance.
In this respect, the book does not so much read like Michael Crichton's Rising Sun, rather it reads more closely like a work by Barry Eichengreen or Paul Krugman (who are both frequently referenced). Having previously studied monitary policy, such as the transfer from Pax Britannica to Pax Americana, and the subsequent end of Bretton Woods in 1971, Subramanian does provide an interesting new light to look at the ups and downs of Dollar Dominance, and where it is going.
The most crucial chapters, the ones requiring further revision, are the latter chapters detailing how a country is able to achieve reserve currency status, and what are the pros and cons of doing so.
In this respect, this book is a very informative and readable work for those who wish to understand monetarism, rather than just another book on China's rise.
On the whole, a very academic book, who's only flaw is perhaps that it reads like a PhD Dissertation that wasn't properly converted into book format, but that is not to detract from it's outstanding merit, namely being a very effective study of Monetarism more than anything else.