Happened to pick up this book in a book store in LA en route to Maui. It was a reasonable price compared to Lonely Planet/Rough Guide and also had good maps and pictures.
On arriving in Maui, this book proved to be a total bible, infinitely better than other guide books. It defined in great detail exactly where the turtles are for snorkelling, where the crowds are not (very important!), the right time of day exactly to see which area of the island, spot on reviews for dining options and much more.
I cannot rate this book highly enough and genuinely believe it made the difference between an ok trip and the awesome trip that we had.