What works?
Wi-Fi
Bluetooth
RIL (Calls, SMS, Mobile Data)
Sensors (Accelerometer, Compass, Light, Proximity, etc.)
Camera
Video (playback & recording)
Audio (playback & recording)
GPS
Everything else not listed under "known issues"
Installation
Make a backup!
If you were on CM 10.1 or a stock ROM prior to 4.2, upgrade to stock 4.2 first.
Install ClockworkMod recovery with SELinux support. Older CWM will result in a "status 7" error.
Reboot into recovery
If you are using a recovery which mounts /system on boot, unmount it before installing
Wipe data if coming from stock or other ROMs (You may get a "status 7" error if you fail to wipe.)
Install the ROM
Optionally install the Google Apps Addon (In Marshmallow, you MUST flash gapps before booting into the system for the first time or else the proper permissions will not be granted resulting in Setup Wizard crash. If you experience the crash, you will need to do a factory reset.)
To upgrade to a newer build, simply flash the zip. There's no need for data wipe or flashing Google Apps again. (However, if you are experiencing strange issues, you may want to try a wipe.)
Changelog
20160116: Initial alpha release
2016-04-20: Fixed 2g and 3g switching
Fixed portable storage
Fixed video recording
Fixed 1080p video playback in mx player
Selinux is in enforcing mode
Fixed root explorer force close
Fixed root mode in cm file manager
Credits
CyanogenMod team @pawitp - for patches @haky 86 for some help 
@ [MENTION=5999439]GHsR for updated device tree
Thanks Weritos port lenovo a706