My car came w/ a Garmin navigator, but I wish I had a Navigon navigator instead. Back in summer 2009, I read a Wall St. Journal article that gave loads of accolades about the Navigon app. Based on that article, I bought an iPhone instead of a Blackberry, just to use this app and thereby saving money on GPS units at airport car rental booths. It paid for itself on my first business trip after purchase. Like any software, this has had glitches. But, Navigon eliminated them ASAP. And I wish it had a trip odometer, a handy bicycle touring feature. However, I consider this app has been well worth the purchase.
AcuteWatcher about NAVIGON North America, v2.13