When you get app connect installed and you then Run Apple Car play or Android auto, you will then get full functionality re using voice control etc. to read / respond to messages, although providing you have given the appropriate permissions on the phone, then within the "Phone" app part of the head unit, you can see and read all your messages in there (where you would expect them to be really).
On a separate note, even though on my latest GTI I've taken a step down from the previous two GTD's in not speccing' the top of the range Discover Nav Pro, I have to say that the latest presentation of app connect in the 3rd generation head units is much, MUCH quicker in booting, reconnecting etc, and makes it now an absolute pleasure to use. Android Auto is now up in a matter of a few seconds from start up, and access to it from the dedicated button on the 3rd Gen units makes it really quite and intuitive to use.
