All good on my side. Battery performance and everything else is great. Like @ingbrzy said, if you are moving from developer to stable version, you need to wipe data.
Sorry, I am using default apps and it is all good in my case. Good battery time, system is very responsive, viber, whatsapp, skype, bluemail, linkedin, facebook, chrome...what else do you need? :) ..and you can update without losing any data..
Just want to say, after updating to v9.2.3.0, my Mi 6 works great. All problems that I had before are gone! Thank you @ingbrzy!
For me, you don't need to hurry with O, just keep N running with as less bugs as possible.
Mi6, 7.11.23, step counter doesn't work. Everything else is good, much better memory optimization and overall feeling.
Had issue with microphone but after PCB replacement everything is back to normal.