Yesterday a local installer completed the Apple CarPlay and Android Auto add for my 2017 Launch Edition DB11. I have tested Apple CarPay, wired or wireless and it works as expected, Apple CarPlay launches when I start the car. The kit used was from ZZ2. Using Spotify as my streaming source, I can't tell a difference between audio quality from wireless Apple CarPlay vs. wired factory media option.
Labor and parts total was $2500. It is well worth the upgrade, as it enhances the overall driving experience. Lack of touch screen doesn't bother me, and the wheel is used to navigate while in Apple CarPlay.
Just wanted to post my brief experience of this install with other DB11 owners. Cheers.