I like that it is fast when computing the route and has a large database to find your exact place you are supposed to be. It has a screen that is easy to follow so you won't make any wrong turns. It is easy to setup and saves you from looking at a map during your driving.
I love that it is portable and easy to connect so that I can easily move it back and forth between vehicles as well as it always gives clear directions to get me to where I am supposed to be. I have a bad habit of getting lost everywhere, so this GPS device is my savior in my car.