@m4tty personally I wouldn't bother, I'm currently selling my Mk5 & im not even going to remove the dynavin N6 on trade in, if I was to do it again I'd buy a kenwood.
Maybe I'm being too harsh, I mean, but now have Bluetooth hands free, iPod connectivity, BT audio streaming, & sat nav, it's just the sat nav isn't very good really (just the maps) but everything else works very well.
I paid a lot less than £550 that was on the receipt, if I had paid that I wouldn't of been very pleased.