I like how it can wake my iphone and work though the lockscreen. it ties in to the top bar on the phone if it is doing something else, and the text is clean and easy to read. However, night mode either doesn't exist or doesn't work for me, and there are missing features, like lane assist, an accurate speedometer and street views of the house I'm supposed to turn into.
I grew to like navigon nagging me to control my lead foot. It's improved my fuel economy.