This week I've been trying Android Auto out in a rental car. I'm not impressed so far. Google Maps has worked okay, but Spotify has not. I don't know where the line is between Android Auto and the Jeep Cherokee interface, but the turn by turn directions are super quiet compared to the music with seemingly no way to adjust. Squarely on the Jeep UI side, I've been using the car for 4 days and still haven't figured out how to turn the radio off but keep the screen and turn by turn directions running.

While I haven't tried it, Osmand recently added support for Open Street Maps on Android Auto. I'm hopeful the experience is decent, but not willing to pay for it at the moment.