does it work for daily driver?
I haven't flashed the 2019 build GSI. But the one which OP installed, it works fine. I've been using it for a week.
Smooth performance. Decent battery life (better than MIUI on SOT and deepsleep/idle). FP works flawlessly (note: you have to flash it from miui stable 10.2. If you come from miui 9, FP won't work). Notification LED works (but somehow it doesn't turn on when charging). Google cam works perfectly (but you can't take slowmo).
Downside:
-Double tap to wake doesn't work (I'm not using it anyway)
-Over saturated image/video from third party app (like when you take photos directly from IG, or video call from Line/WA). But gcam works fine.
-You can connect your Bluetooth headset with the phone (it can be paired) but somehow it can't play the music. Phone call from bluetooth works fine.
-As mentioned earlier, autobrightness and always on display doesn't work.
Overall I think it's usable and I'm happy with it. Still wait for the next build tho.
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Edited: I've flashed the 2019 GSI ROM, and it's even better. You can hide notch from the dev options. Always on display and autobrightness works, as mentioned by guglicap. Now I'm still looking for the workaround for bluetooth audio issue.
))
