I am a huge fan of the guidebook but agree with the other negative reviews above. I bought the app and found that I still needed the book. In fact, the app made me miss a few stops on the road to Hana. The gps listed how close stops were to my location, however the list would include stops that were behind me. Also did not take the curvy road into account and caused confusion on how far points of interest were. Buy the book and you will be fine. Maybe Wizard Publications will get their act together and make this app usable but until then stick with the book. I would even go so far as to suggest some of the positive reviews are fake.
Egrose610 about Maui Revealed