I’ve got an Audi Symphony in my A3 (identical to the Concert but it has an internal CD changer that takes up to 6 discs), as well as the iPod dock in the glovebox.
I’m an old git and iPods /MP3’s aren’t my thing , to me in-car music comes from the radio or a CD!
I was lured by the aesthetics of an RNS-E and so bought one and fitted one but removed it after about 2 days, luckily I didn’t lose any money on it as they’re easily sold on.
I had a few issues though which perhaps I could have solved had I persevered but tbh it was too much hassle ;
1) The radio reception was not good.The RNS-E when factory-fitted uses a differently wired antenna circuit .
2) The RNS-E is only a single disc unit. I had to obtain a glove-box mounted CD changer unit to make it a multi -disc set-up and never got it to work properly.
3) The RNS-E unit disc drive kept ‘waking up’ and making a whirring noise about every 10 minutes even when switched off, again this was something to do with it being a non-factory installation .
Long-term this could cause battery drain issues but my OCD wouldn’t allow it to get that far ,LOL.
4)The biggest issue to me was the fear that I’d come back to the car and find a brick through the window and a big hole where my RNS-E once was ! The idea of putting a coat or blanket etc over the dash to hide the unit every time I parked up was daft , theft of these units appears to be common , and the presence of an RNS-E in an A3 really seems to increase the chance of a break-in.
I don’t miss the RNS-E at all , I love my old fashioned Symphony even though it looks antique in comparison and simply use a Tom Tom if I need sat nav.