I got my 32GB ATV4 this morning and I can say that I'm very happy with the new user interface and app store. I can't wait to see what the developers will come out with for bringing new experiences to TV. I prefer the new remote, it's a nice sleek design and I particularly like the fact it can now be charged! No more finding new batteries. The setup of the ATV4 is now seamless too. Allowing you to simply place your existing iOS device next to it and setup the ATV based on your iOS device settings (e.g. network, icloud, itunes, etc).
However, my main gripes with it so far are:
1. Why cant we still view TV shows and search for local library media properly!? This is an annoyance for me. I have an enormous movie and TV show library. If I go to my TV shows, and find a show that has a large number of seasons/episodes, it's a nightmare to navigate through. It should be Show>Season>Episodes, like most other applications. If I want to find a movie that starts with 'R', good luck scrolling through hundreds of other films before getting to them. Apple want us to get involved with there eco system by purchasing music, video and tv shows from there stores. Yet make the user experience terrible when we then want to interact with them via the ATV.
2. Never fear, surely the solution to problem 1 is Siri? Well think again, currently Siri does not support functionality for your existing iTunes library (I'm assuming/hoping they will in future).
3. I like the remote. However I often finding myself using it upside down and wondering why the scrolling isn't working.
All in all, I can see that this product will become very good in the near future. However, currently it isn't really much different from the old ATV. I'd recommend getting one but maybe in a few months time.