Has anyone got any experience of this app. There are no reviews in the app store and can't find much online. Is this turn by turn directions for the iPhone, is this the one?? The full map according to their own website is over 5GB, flip that would be alot of an 8GB iPhone! This is the one app I am dying to see, turn by turn. Come on Apple make it possible - even if you have to drop Google for it (legal?) turn gps could change the game!?