I really liked this book, and it truly is one of the great works of evolutionary biology to come out in the past decade. A wonderful, in-depth, and interesting summary of the field of speciation research. Coyne and Orr do show their biases (and the book does have a heavy Drosophila melanogaster focus), but that is actually quite refreshing, because they don't often obscure other points of view -- they take a very balanced approach in most chapters. It's a great read for scientists, but not recommended for the general reader, as it is still quite technical and dense.