Had a decent play around with it. The quality is friggin' excellent. Streaming a live basketball game from the States and I can see the pores on their skin. On the Apple TV it's perfect.
Downsides I've notice so far:
- On Android there's a chromecast button but it's disabled
- On PC you can't make the stream full screen. There's a button for it but it currently doesn't work
- When streaming live games on two devices at the same time there was some issues. No buffering, the quality just lowered. But that's probably my internet connection
- Was originally streaming on android. Then stopped streaming on android and closed the app then started streaming on Apple TV. While streaming on Apple TV I tried to stream on PC but it said that I was already streaming to 2 devices (2 simultaneous device limit on base subscription). Fortunately I backed out and went straight back in and it worked fine
- It currently only works on PC/Mac via browser. Chromecast from PC/Mac browser only. Android and iOS streaming on the device only (no sending it to TV). And Apple TV (3rd generation or later). No support for gaming consoles
Keep in mind this is currently in beta and has only been released recently.