A rather slim text for such a large country. The descriptions of the various locales are VERY limited. The size of the book only allows for (what reads like) tiny excerpts from much larger texts. The descriptions of Hong Kong along are tiny, with one good recommendation - visit the Museum of Hong Kong. But, Hong Kong is packed with interesting activities, this book will not help you there. There is just not enough information to allow for any reasonable visit to such an overwhelming country.
For China, you will be better-served by using several different guides. Plus, a history of China is highly recommended. A book about each city that you will visit is recommended. A single book for each city will still be inadequate, but will prove far more helpful than this book from Lonely Planet. Lonely Planet is generally a sound source for travel guides. But, with this book, they "bit-off more than they could chew".
* I gave 3 stars for the nice photography, and the fact that it does contain some useful information. Lonely Planet is trying hard with this book. But, it is simply not possible to encompass China in one small book.