Finally got my Discover Media that I ordered on
http://vagtec.co.uk 
(I was a bit anxious because they took 3-4 weeks to ship it and it was quite a lot of money, but everything was fine)
Installation was super easy. Plug and play. As they said
Big problem is that I lost my rear camera. Hopefully they'll find a solution for it...
FM, DAB, navigation, phone, music everything works perfect
Display is very sharp. Very nice resolution
Finally a touch screen that works ! As it should be. (my previous RNS510, then Z-E2026 were just sh*tty experiences)
I couldn't have App-Connect to work so far. Probably I miss the right cable. But I'm not sure it will be really useful for me. I doubt I will use CarPlay actually...
What I would like to have is Car-Net (control the car, a/c from the phone, send destinations for gps.. as I understand it)
But I doubt it will ever work, since it asks to register the car with its VIN, which is obviously not recognized as car-net compatible.
If anyone has any idea...
Anyway, I really like it so far. And thanks a lot to the guy at vagtec who is really helping
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And my car is a VW Golf cabriolet 2014 MK6