This is the most amazing travel guide I have ever read. Every time I go away I always buy a Rough Guide (nothing else compares) but this one really does surpass all expectations. Having just returned from a 2 week holiday to California, I fully recommend this book. It has everything, down to the last detail. I was so impressed with the accuracy and attention to detail - whoever wrote the book must have spent a long time researching it. We travelled LA, the 2 day drive to the Grand Canyon (taking in Joshua Tree, Mojave and London Bridge...), the Canyon itself, Hoover Dam, Vegas, Death Valley, the California Coast and finally San Francisco. This book has everything about all of them, and more (we missed out Yosemite...). Its not just for backpackers too (as "Rough Guide" may suggest??) - we had pre-booked hotels and a car before we went (all the details of the hotels came from the Guide).
If you ever go to California - do NOT be without this book!