We are leaving for Alaska in just over a week. I know the Toursaver book is a good idea, but what about the Toursaver iPhone App? Based on what I read on their website, it appears to contain the same deals as the physical book, costs $20 less ($79.95), and there are no shipping costs. Given all that, it seems like a good idea, but would love to have that confirmed by someone who has used it. Anyone out there with first hand experience?