Just recently fitted my RCN210 unit into the GTI, connecting is a bit different as it requires a Quadlock to ISO adapter with extra CAN wires to feed additional power from the Air Conditioning unit. It does sound daunting but it isn't really once you get into the swing of things!
Has a Radio (No DAB but I rarely listen to radio anyway), CD Player, SD Card Reader, AUX, USB, Internal Bluetooth (A2DP Stream + Phone Support) and Mic built in to one unit so no need to rip out the a-pillars or buy expensive separate modules! Plus as an VW OEM unit it fits to the MK5 dash perfectly! Below shows my phone connected up to the BT system with the air con working fine!
The finished article once it's all wired in - excuse the tacked on screen protector! Didn't really need to use the new 7N0 gateway in the end!
Button backlighting matches to the OEM dash, I had this unit along with a really old Canbus Gateway for a couple of days now and pleased to report that I had no battery drain issues so far!
Automatically switches off when the key is pulled from the ignition too.
The best thing about it is that it only costed me just £50 all in (the unit and Quadlock adapter is £45, an extra fiver for the dual Fakra cable to single radio connector), a nice cheap OEM upgrade until I get some spare cash lying around for the touchscreen units but this will do nicely for now!