It was almost exactly a year ago that I reviewed the first version of the Magellan RoadMate app for the iPhone. Over the last several months the price has dropped, and features have been added.
In the latest update of the app, released this week, RoadMate USA now fully supports multitasking and fast application switching. If you are listening to music, it fades it for voice announcements, and voice guidance continues if you switch to another app. There is also an option to pause audio, which is nice if you're listening to an audio book and the voice guidance needs to interrupt.
More value from Magellan: traffic info is now free (with a catch, see below). You won't need an in-app purchase or any kind of subscription. I consider that a big plus if you commute in an urban area. The app also allows you to share your route or points of interest via email or with another Magellan user.
In a test drive, everything functioned very well. The voice guidance is clear, and you can choose a male or female voice, as well as other languages. If you zoom out and are in 3D mode, you can see the terrain, which is a nice feature. In downtown areas of bigger cities, you get 3D renderings of major buildings.