[andor]

I have Nokia HERE maps in my car (Volkswagen), and so far I can't complain about the quality. Map updates are free as well, simply download a 6 GB archive and decompress it to an SD card.

What I don't like compared to Google Maps is the general slowness of the system. After turning on the ignition, I have to wait about a minute until I can enter an address. Entering a new address (vs. loading a recent one) again takes a minute. That's why for shorter distances I still use Google Maps.

Edit: the strongest point of Google Maps, and the weakest of OSM and my in-car navigation is the geocoder.

[vetinari]

What you have in your car (Columbus?) is just map data from Navteq (Nokia), but not the navigation app. So the slowness is on the VW and it's supplier.