Spoiler: I've been driving a Chevy Colorado for 2 weeks and it has CarPlay... there are some nice features, and some that are completely infuriating. I've always said that I don't think it's as big of a deal as the media makes it out to be, but nice to see Lexus at parity regardless.
Since CarPlay mirrors whats on your phone, if you are playing music but try to open news, facebook, etc. the screen changes and exits out of music... when you wanted to still listen to music but just read a story or fb post. Same for messages. The functionality for replying to texts via voice is great, but that's the only thing I really like.
They're basic and devoid of some features, but quite frankly, what I love about Entune and the Lexus' interface is that they're so easy to use. Some people don't like the RTI, but the overall experience is easy and uncomplicated. CarPlay has a lot of annoying rules.