We had the RNS 510 in my wife's 2012 Tiguan and it was nice - bigger screen, loads of extra features, etc. But it was also very slow. When we test drove a 2014 EOS, my wife and I were blown away with the responsiveness of the RNS 315 unit and since it had the features we wanted, we were good to go. Now I do wish the Komfort had the back-up camera and the steering responsive headlights. The headlights are cost prohibitive to retrofit and I've not been brave enough to dig into the back-up camera retrofit. However, I did add the paddle shifting steering wheel from the Sport trim. It wasn't cheap, but boy is it fun!