I would highly recommend going for the old nav unit, not the new Android one. Atleast not yet.
I have one, and am suffering. It stopped working after 2 weeks of purchase. imagine the frustration when buying a 2million car.
It lags alot, and when you start the car and shift in reverse, camera will display after 38-60 seconds. Who waits a minute to be able to reverse. ofcourse you can easily reverse without the camera, but then why spend so much on reverse camera option at the first place?