Just tried the latest version, so here's a bit of feedback
1. Menu navigation method is set to gesture mode by default, so I had to set it to 3-button mode.
2. If I decide to run Scrcpy with settings that crop the screen, the screen on the actual phone also crops, I'm not sure if that's intentional.
3. If I have an 8BitDo SN30 Pro+ in DirectInput mode connected through either Bluetooth or USB, the A button does not work at all. This isn't a problem with the stock or Xiaomi.eu ROMs.
Other than that, I do like the performance gains I get with ArrowOS. It's just frustrating that I am unable to use it with emulation.