Hi,
Just got myself a Shield ATV, waiting for it to be delivered now. It will be by first ATV device.
I've had a Chromecast for over 2 years and have loved it, but I know that Android TV has the cast functionality built in, so I'll probably be retiring the Chromecast to my parent's house. But aside from casting apps and webpages, one of the things I really enjoy about the Chromecast is the beautiful looping pictures that it shows on the screen when idle.
Is there an equivalent to this on Android TV? I'd hate to lose seeing all those beautiful pictures from Google+ and NASA and other sources, yet it seems ridiculous to keep the Chromecast just for that.
Android TV's do have daydream mode, but as of now it is slightly gimped compared to the Chromecast.
For example, there is no way to have it cast your own albums like you can with chromecast & you can't check on the source of the picture like you can with the Chromecast through the app.
You didn't mention either of these features in your post so I'm assuming they aren't super important to you. If that is the case, your SHIELD TV should function almost identically to your Chromecast!