Hi benni.

I bought a unit on ebay and had my local VW service centres install it and an ebay sourced Bluetooth (got lazy and couldn't be bothered doing the cable run for the bluetooth). Some service centres seem unwilling so maybe shop around.

Worst to worst, there are some guides floating around on how to install it all and beyond a few hassles with removing the A pillar and not having an airbag deploy in your face, it doesn't seem that hard.

As far as coding goes, VCDS is your friend. The service centre who installed mine couldn't get the MFD integration working but a few minutes with VCDS and I got it all working. If you don't have a cable, there are people on the forum who'll help for a case of beer!

Good luck!