This book is absolutely essential for any birder who plans to visit any of the regions covered in this guide. The plates are very good and the descriptions are detailed. This is probably the most up-to-date guide for the region. The taxonomy is based on Sibley and Monroe, and nearly all subspecies and their ranges are listed. There is even an edition in simplified Chinese available in China and Hong Kong. However, covering such a broad region has its drawbacks, and at least in Taiwan, I recommend that this book be used more as a reference than field guide. A bird's voice often varies across its range, and the status of a species in one location can be completely different in another. For example, the White-bellied Green Pigeon, described by the book as "very rare," is in fact common in Taiwan. The quality of the plates is sometimes inconsistent (e.g. the geese and swans on plate 7 look very small!). Also, errors I've noticed include where the range map does not correspond with the descriptions (e.g. Eurasian Jay, plate 67), the bird number on the plate does not correspond with that of the range map and descriptions (e.g. Varied Tit, plate 88), and some typos (e.g. Pygmy Wren Babbler subspecies, plate 105). Although Appendix 2 lists the species endemic to the region, it left out at least three species from Taiwan (Yellow Tit, Collared Bush Robin, and Taiwan Whistling Thrush). In general, this book is excellent and highly recommended, but I do hope a new edition will be published in the future that fixes the errors and include new discoveries made since publication (e.g. Chinese Crested Tern, Taiwan Bush Warbler).