[Nexus 6P General] PieOfJustice:
Latest working build is posted. I know a new version based on the new updates will be eventually released but OP is taking some much deserved time to rest. You can always build your own by following this thread.

http://xdaforums.com/nexus-6p/general/building-miui-nexus-6p-t3472983

---------------------------------BUG LIST UPDATED OCT 25 2016-----------------------------------------

6.0.1 MMB29V BETA (Second Update)

Working

Booting

Setup

Sending Phone Calls

Sending SMS

Receiving SMS

Mobile Data (LTE / 4G)

Wifi 2.4 / 5

Playstore (including apps downloaded)

Root (Including Root apps)

Share Features

Battery Life (Stable as stock so far)

Camera (Auto HDR seems to be missing)

Account sync (Contacts, mail, Google account info)

Alarms (Important in a daily driver)

Touch Screen

Gyroscope

Fingerprint reader

NFC

Bluetooth

Not Working

(Or not working for everyone)

Once you turn on ADB Debug in dev menu, ADB cannot be given permission as you can't clear the fingerprint hash or approve it via MIUI. The only way to issue ADB commands is to boot to the bootloader and issue them from there.

MMS (Sending or Receiving) - Temporary problem, usually fixed via APN settings. I have yet to be able to get this to work. Others claim it worked after installing ROM without issue, others disagree)

Cellular Data Warning (Just goes off like crazy even when disconnected from Cellular Data) *This can be turned off

NavBar Full Screen Emersion (Has a habit of not disappearing into the background like it should)

System Links and some Web Links Crash (When following links to other parts or apps within MIUI 8 the app your using will crash.

Uploading via Browser or Chrome crashes the app. (Trying to upload anything will just crash the app.

Theme app will crash when clicking certain links. (Unknown why this happens atm)

Anti Virus scan is

broken and doesn't do anything

. This has been a problem for a few versions of MIUI and is unknown exactly why they keep including it. You can use test viruses to confirm but I've side loaded real dangerous ones in controlled tests and they are also not detected by the virus scan.

Default Clock widget is slightly cut off due to a sizing error. This should be fixable via edit before building.

Important Info Before Testing

Installing XPOSED will render your phone unable to boot into MIUI. There isn't a compatible version just yet.

Make sure you know your ADB (Debug) commands or you are using a good toolkit.

TWRP is pretty much essential.

Themes are not enabed by default and not all themes work.

Sharing is pretty broken by default. Enable "Documents" to allow this. As mentioned in bugs some things still don't work as expected.

You don't have a SU handling application available by default.

Don't forget to add an English keyboard if your using the Oct 7th build as it doesn't currently have one.

Most of these are covered by OP

Differences

These are things that you might not be used to compared to stock Android, but you should know if your going to test this.

NavBar buttons are swapped. Back is where multitask should be and Vice Versa.

Double tapping power button no longer brings up camera. Camera shortcut is still on lockscreen and working. You can bring the Camera up by double tapping the Volume Down key.

Notifications are not stored on lockscreen by default.

Random notifications from Chinese apps. (These are default apps and are part of MIUI. You can disable or mute them without issue.

Third party themes can NOT be installed by default. You need a Theme Dev account linked to the Theme App in order to use them. Otherwise you get a download error. Theme Dev accounts are approved by Xiaomi and can take some time before approval is granted.