I have an XCarLink in my 55 plate A4 with the standard Audi Concert stereo.
It is not without fault, but I’d recommend it. My iphone connects to it easily, the sound quality is great and I can control skipping tracks from the little control wheels on my steering wheel.
A few observations:
It works by pretending to be a CD changer, so if you already have a CD changer I’m not sure how they co-exist.
It uses the different simulated discs to select different playlists on your ipod/iphone.. on mine it defaults to CD4 whenever you turn it on, which for me maps to the ‘purchased’ auto playlist on my phone so it always plays the same song when I turn it on – this gets annoying!
When it is playing one of the playlists, the display shows ‘accessory connected’ and you can’t use the ipod controls, only the stereo or steering wheel ones. You need to change to CD1 to access the on device controls – once you’ve done this, it is all good – it is just a little annoying having to do it every time.
I suspect these issues would be identical with any of the third party boxes that pretend to be a CD changer.
Like I said, not without fault, but overall recommended.
Dave