I am an astrophysicist doing research in the field of extra-solar planets and this is the best book on the subject that I have read. This book covers everything that an early graduate student starting to think about exoplanet research should know. The book contains a huge amount of information and a lot of references to scientific papers containing more depth on a given topic. The methods and science behind all of the big exoplanet discoveries up until late 2010 are covered in detail -- I am impressed at how up to date the book is given the very fast rate of new discoveries.
I could see using this book as the textbook for a broad advanced undergraduate- or graduate-level class on exoplanet science. The chapters are nicely laid out, with ~half-page explanations of an extremely wide variety of topics and all the references you could need to learn more. There are a lot of figures, in many cases drawn from recent relevant scientific papers, that do a good job of illustrating the key points. There are some equations but only where they are useful.
There is so much useful information in this book that I intend to keep this book close to my desk for the foreseeable future.
I have been trying to come up with something negative to say about the book so that my review appears unbiased but I can't find anything -- perhaps the overabundance of references although in general I found that the right references were chosen for a given subject.
I fully agree with the elegant praise from Andrew Cameron's review -- this is an excellent book!