For those of you looking to upgrade your rooted Android 6.0 Nexus 6P, check out the Chroma ROM, which is based on latest Android 6.0.1 and gives you additional features/customization over stock. I have been using Chroma ROM with the original Nexus 6 and have to say this is one of the most stable/fast custom ROMs I have ever used.
First, the Chroma ROM offers development options and System UI Tuner out of the box, no need to enable them manually. For customization, Chroma offers personalization through its Chroma settings that allow you to tweak your status bar, navigation bar, lock screen, power menu, volume rockers, and add gesture shortcuts (3-finger gesture screenshot). You can also enable multi-window by enabling it in development settings.
Of course, everything else works just like stock ROM including fingerprint sensor and you can even make Android Pay work while rooted. For making Android Pay work, please refer to these instructions here.
Overall, this is an excellent ROM for those of you who want the latest Android 6.0.1 plus mentioned features so definitely give it a go this week(end) and do let me know what you think!
You need a rooted Nexus 6, if you do not have a rooted Nexus 6, see How to Root Nexus 6P first!
For installation, simply reboot into recovery, format /system and /data, then install ROM, Vendor zip file, and Gapps. You can try installing without wipe if coming from stock firmware but make a backup ROM beforehand.