I guess it depends on what you want to do with the phone and NEX. My experience with the iPhone 6, CarPlay and the 8000NEX has been nothing but positive. I tried and quickly stopped using AppRadio due to all of the issues that have been well documented here.
It seems to me that Apple has done a good job integrating CarPlay with the NEX radio. Most of the time going back and forth between the two systems is seamless. As far as the maps thing is concerned, I have no issues with the Apple maps. While Waze is cool, any crowd sourcing app needs input from its users in order to make it work. Unless you live in a urban area, it really does not work well. And traffic is the one redeeming quality with Waze. That's just my opinion of course.
iDatalink has been a bit of a disappointment for me as well. The only thing I am getting out of it is my steering wheel buttons. In hindsight, I guess I should have choosen a less expensive option to get what I needed. At the time I was a Ford Sync users for many years, and I did not want to give that up. And iDatalink promised that. But, CarPlay does everything that Sync did, plus it's a lot more speech friendly with Siri.
I spend most of my commute time listening to my music library, Sirius Radio or podcasts. I am still waiting on a
true Beats CarPlay app, but I can stream that from my iPhone easy enough. I do plan on using the MBL At Bat CarPlay app when the season starts, but beyond that, I'm not sure what kind of apps I would use... but here is my wish list.
Gas Buddy app to find the cheapest gas when going down the road
Yelp
Waze traffic inside of Apple Maps
Travel pointers to talk about specifics of an area that one is driving through. This would be kind of cool and educational
What's on your wish list?