We have GPS TomTom we have used just a few times. The only thing I don't like is if you are following its route and then change course, the TomTom will keep telling you to turn around to get you back on its course. It takes quite a while before the TomTom figures out that you are going a different way and recalculates the directions. So if you are going on a trip and decide to take a different exit it will keep telling you to turn around and it gets very annoying until it recalculates a new route from your change. Maybe we aren't using it right? Hopefully someone else knows more about them!! But I am glad we finally got one and can see us using it often.