Likes: The remote-swipe is more accurate than expected and the remote itself has a nice feel. Computers: Communicating and navigating media from my Mac is much more smooth than my old ATV.
Dislikes: No shuffle playlists in Apple Music? Hope that changes soon. Sparse pickings and clunky navigation in the App Store. I can see this getting better over time though.
So far I'm digging the new ATV 4-Gen. for sure.