I don't have any problems so far. I'm on Joyeuse and it seems the battery performance is average or pretty similar to the stock ROM. I even dare to say that is kinda better than having the stock ROM. Sometimes I forget to connect the phone to the charger at night but I noticed that the battery doesn't drop any single percentage of it's energy. Maybe I don't have problems because I made a fresh and clean flashing.
I only see battery draining everytime I play, but at the same time, the games seems to run smooth as butter, reason why sometimes the phone gets hot. In my case I'm an active player of Genshin Impact and I can say that with this ROM it runs so much better than with the stock ROM. Without any lags, even with better graphics configuration.
On the other hand, the launcher sucks so bad. Sorry, is too stock for me and it lacks of good options. So I decided to install Nova Launcer 7 and OMG, is beautiful!!
I discovered that, unlike Stock ROM, you can mount System folder as R/W, so you can make mods directly on the ROM without the need of Magisk modules (Knowledge needed before modding the system partition permanently to avoid issues or softbricking).
I hate the Google Sans font used in this ROM, it looks awful mixed with Roboto. Sorry but I need to say it.
Well, I can say that this ROM is one of the best ROMS I tried so far. You can activate call recording via magisk module, record audio with ASR app and video with SCR app (much better than MIUI ones), I missed a good camera app but trCamera makes a very good job with 4k recording and 60fps 1080p support for video and 16mp camera, portrait and macro support for photos. It doesn't have all the functions but it works very well. I tried ANX cámera but I could never make it work.
For music player and equalizer I recommend Poweamp, since Viper4Android can be better, is kinda complex to setup and I'm a little lazy in fact. With Link2SD you can remove the apps you don't like, and even unfreeze a terminal app it has hidden.
For call recording I follow this tutorial from here and it works flawlessly:
Call recording on Google Phone is only enabled for selective devices in Few Countries and unluckily it wasnt available for POCO F1 but finally after fidelling for so long I was able to enable call recording on my Poco F1 running AEX 11...
forum.xda-developers.com
Even Huawei health works awesome with this ROM, without disconnecting my Huawei Band 6 from the phone every time I connect my headphones as well as It happened to me with MIUI Stock ROM.
Features I miss? Floating windows, Game Turbo (because you can use other apps over your game), and the stock camera app... did I miss another thing?? I guess not, I love Xiaomi but I hate the fact that is full of bloatware.