I was wondering that as well. I just bought a Golf TDI (yay first VW!!!!! I love the car by the way, not so thrilled with the audio.) I was thinking of going Sony XNV-660BT because of the Tom Tom GPS, I heard that the Pioneer navigation wasn't worth writing home about.
So three questions:
1. @Muthafunk: how is the navi on the Pioneer?
2. would I be able to use the OEM bluetooth mic?
3. Does the PAC modules retain functionality on display track titles on the dashboard?
Thank you! You were an inspiration to us all!