Fitted and tested on way back to Brighton from the midlands.
The built in Garmin navigation does display on the DIS, not quite as well as the RNS510 though. Air Con, heated seats and parking sensors display on screen, though not flawlessly, the unit needs you to 'Agree' to terms every time it switches on from cold so you can't see the parking sensor display until you've pressed it.
The unit is as expected, it has all the bells and whistles but not quite the grace of the RNS510 and is much harder to use, I'm fairly techy and some of the Garmin functions I had to read the manual for, just not thought out that well. The whole user interface is flashy and quite American.
Will post a full review soon but initial thoughts are, if you want a factory fit then its easily the most advanced option available, it has CarPlay, Android, Sat Nav, Bluetooth Calling, USB / HDMI input. DAB+, Spotify built in (unlike CarPlay this works wirelessly) Camera inputs, Dual Zone audio and much more.
If you want a straight forward option and are more used to the simplicity of the VW units then I'd recommend trying it out first somewhere.
More soon.