for day to day driving i dont need a navigation at all. i just purchsed a magellan 700 on ebay for almost free, in like-new condition (meaning this thing doesnt even have a scratch on it, no joke), so i just have it sitting in the rear shelf, and if i do need directions i would pull it out and plug it in and find my way home, no need to have it sticking on the windshield 24/7 just another reason for someone to break into my car.
the fact that it talks to you is awesome, i sometime feel like i should just have it sit in the rear shelf and listen to i tell me where to go instead of looking at it