Can anyone enlighten me, please? What is the benefit of the media interface (on say the B class) compared with just the normal set-up which I think has AUX In in the glovebox. Friend wants to run i-pod etc and wants to know if worth the £350 extra for the media interface. Second, anyone describe the difference between the arrow type sat nav at £1150 odd compared with COMAND at £2100? The cheaper one says: - Audio 50 Includes radio, DVD arrow navigation system with TMC (Traffic Message Channel) and Linguatronic voice control; integrated CD/DVD changer (6-disc) with MP3 compatibility This includes media interface (which on its own costs £350 and comes with Audi 20 as standard).