I use Android Auto daily, with an AtomXL, and had no problems. You do need to have the Android Auto app installed (https://play.google.com/store/apps/details?id=com.google.android.projection.gearhead).
I get an occasional message saying that Bluetooth has disconnected, but it has little impact on the experience - the music continues playing and maps keeps directing me, so I've blamed the car for that one.