If you like recommendations on restaurants, sights to see, places to shop and bars to drink in, then this is a great book.
This is my 3rd book on Bangkok, all of which are very good, but I always go back to the trusty Lonely Planet Guide, and this doesn't disappoint.
It has lots of great maps, one of which can be pulled out and used on the go, and it gives great recommendations on ways to spend a morning, or an afternoon, or even a whole day, in different areas of Bangkok.
Whenever we have gone to a restaurant listed in this book, we've never been disappointed. The same goes for bars and sights to see.
I would thoroughly recommend it!