Usually those legal streaming video app jitter only happens to original ATV are because original ATV have L1 cert capable to HD quality.The app will check the device Widevine certificate that encrypt the video. Those non ATV app will make the video jitter when the video quality is HD and will smooth back if video quality drop to SD quality.Same goes to Directv tablet app.

Those Android tv box will only have L3 which only can watch in SD quality if the app have checkings

Work well, but the quality more like sub hd which in my opinion not really HD like in iflix and netflix. With new version of aotg, their quality a little bit crispier but might not able to tell in human eye at far.

Like I mention before if the app have implement DRM checkings to prevent people pirating or illegal streaming.Astro already aware this aotg misuse issue so they implement it in the new version