Just got through running the first scenario and my players loved it. This book has some great content and history of 1920's Shanghai. We played using CoC 7th ed (included in the book) and it worked great. Definatly worth it!
The material covered in this book is simply amazing. Very high value indeed, which reflects that a considerable amount of research was done to put this book together. Every Keeper should have this book in his or her collection. A must buy !