Just returned from a trip to Kauai and Maui. Found the Kauai guide to be extremely current and useful. The Maui guide was useful as well, but seemed a little more outdated, particularly with respect to restaurants and some recommend hikes which are no longer available. That said, I would still highly recommend getting this application. Its a little clunky, but very useful. Like other reviewers, Id strongly recommend adding a whats near me feature, rather than just listing things by region.
ON95 about Maui Revealed