There's some issues with the UI of the Channels DVR client on the Air TV Mini.
The playback bar is missing. You cant really tell where you are in a recording or time shifting while wahcin a channel. This may be a "tile" issue as the bar pops up initially (only for a second) once in a blue moon.
Also when you push "up" while watching a channel, and it gives you whats on on the other channels, that bar takes up almost half the screen, vs about a quarter of the screen as seen on the XIaomi Android TV box.
Hopefully channels would consider fixing this, The Air TV Mini is a decent Android TV box; its playback and UI are much faster than the Xiaomi