Just upgraded the RNS510 map to V10 (Map Version HDD 8554). I've heard this is the latest and probably the last map ever for the RNS510.

Purchased from Eurocarupgrades for $175 (normally $250). DVD came and is a legitimate source and worked as expected. I've heard other websites aren't trustworthy.

I orginally went down the RCD330 route with Android Auto, which was an easy plug and play unit. Although the biggest turn off was the lack of integreation with the other featutes of the car. Clmatronic, MFD etc. And the biggest gripe was the complexity with getting the OEM rear view camera working. RCD330 now happily lives in the other VW car.