Ive got the import road setup.
Its not perfect - but its close. I also have a VW amarok with the factory carplay and its good, the main differences are.
You have to hold the back button down each time you get in to get it to bring up car play. I normally just listen to triple j, but if you are listening to the radio - you dont have any noise from the carplay setup. The import road (and i think naviplus) use the 'aux in' function of the stereo. So - basically leave the car on aux in, and just remember to hit the back button each time you get in.
Due to the above, I no longer use the fm radio - i have the triple j app going through carplay (just be mindful that its using data off your phone to stream). I have also removed the phone from bluetooth, and it just functions through carplay (othewise i think it or you can get confused where your phone call is going.
For me - the big one was having waze or apple maps etc, so the above things arent ideal - but they arent a major, and at the time - I couldnt find a better solution.
If you can - i would recommend trying to see a car that has it installed, so you can go through it how YOU would use it and see for yourself. I asked a few questions that got answered well enough, but I didnt realise some things until I was actually using it.