I am a fan of the DK travel guides, and particularly like the color photography that allows readers to visualize the area more than most other travel guides. In reality I would like to give this guide 3.5 stars, but will have to settle for four. The photography is generally good, and the information is generally correct in my experience. This book features some excellent pointers that are especially good for those new to Hawaii. The book has a brief background section on the islands as a whole, and has decent island by island coverage of all the major Hawaiian Islands (certainly all the ones a tourist would visit.)
My only real critique of the book is that with a length of just over 200 pages, it is not terribly complete given the diversity of the Hawaiian Islands. The hotel (and restaurant) listings are generally accurate, but are not complete, resulting in the situation where some fairly well known and sizeable properties are overlooked, which can be extremely annoying if you happen to be booked in one of those properties. This is by far the biggest drawback to this book.
My take on the situation is that this is a good book for finding things to explore further in Hawaii, but when it comes down to detailed planning, I recommend that you consult other guidebooks; I particularly like the Lonely Planet series of guides, which has offerings for all the islands that you will be interested in visiting, albeit with less captivating photography.