I found this guide useful for planning my trip before I left home, mostly because it includes several pictures and fairly good maps. I used it to make a prioritized itinerary for the road to Hana---which stops to make, which hikes to go on, etc. We only had one day for the road to Hana, so we could not make every stop. I thought the guide did a pretty decent job of sorting out the mundane sites from the must see. The maps for the road to Hana are also very useful. We returned from Hana via the South road at night. It was no problem at all. It was certainly more fun than turning around and going back the way we came. The road is a lot less winding, which was nice. It does go up and down a lot, though. There was nothing wrong with the road at all, but you do need to watch out for the cows. There are signs warning you when you get to cattle country. The cow crossings are kind of a give away too. FYI, we made the trip in an economy car.
I am in debt to Maui Revealed for its recommendation to see Warren & Annabelle's, which was great. I would recommend, however, that anyone going to see this hilarious show should go late. An hour and a half killing time and eating snacks before the show was a drag. I suppose the wait might be more entertaining if you plan to get drunk.
When we actually got to Maui, we used Lonely Planet's guide almost exclusively. We started with Maui Revealed, but then we found that Lonely Planet's instructions were considerably more useful than those in Maui Revealed. In fact, with the exception of the road to Hana, the Lonely Planet guide was far superior for everything.
I would recommend getting both guides if you have never been to Maui before. If this is not your first trip and you do not plan to go to Hana, skip Maui Revealed entirely. It simply does not have enough substance to be worth the time reading it. The "revelations" in the book are all regular tourist destinations that appear to have been visited for at least a hundres years. You will never be alone. Everyone has Maui Revealed on their back seat or in their hand. The recommended restaurants are over priced. I had to laugh when I saw long lines of people waiting to get into a hamburger joint or a local dive for lunch. I would suggest trying the restaurants NOT listed in Maui Revealed. I think you will get food that is just as good and avoid rediculous lines. Best meal we had on Maui? Maui Tacos on our Lanai at sunset. Cheap, great food, and our lanai had a better view than any restaurant we saw! Perhaps Maui Revealed mentions Maui Tacos. I wouldn't know. I got the tip from Lonely Planet.
About the 3rd edition of Maui Revealed, I checked out the 2nd edition from the library and read it cover to cover. I then ordered the 3rd edition online from Amazon. After a page-by-page comparison, I was shocked to find that the only difference seems to be that a couple of pictures were changed. This is the saddest "update" I have ever seen in a travel guide. Buy the 2nd edition if you can get it cheap.
Lastly, we saw several signs with messages like, "Contrary to Maui Revealed,please respect our rights. This is private property."