I have a 2016 with a JBL premium setup. I installed the Carplay box, and it works fairly robustly. It keeps the existing menu, etc., and you two-finger touch the screen to switch to the Carplay unit. I wanted to get a later-model JBL head unit and just swap it out, but was advised it's not as simple as the they also change other parts. like the amplifier or whatever. The cost of installation and supply was around 400, I think. UK, Birmingham.