Hab switch quieter and source the Can Bus Adapter in my Seat Leon 1P Cupra (MY 2008), in conjunction with the Pioneer AVH-8400BT, and no problems with it, track up / down, Volume up / function from the steering wheel, unfortunately go the phone keys not (maybe they are not supported by the radio).
Would be nice if all the wires already tuned connectors have (had some make himself off, but no problem, there was in the adjacent car workshop). But for the price really good!