I was one of the ones that waited for the OTA, being on 7.0 and the October security patch. I rarely sideload, but I'm glad I did this time.
I can attest that in the past 24 hours, after sideloading the newest build (N6F26U) my phone has never run better. The phone runs so much smoother, even at low battery - and the battery is lasting a lot longer, too; I left it unplugged overnight and barely saw a drop. Tried the speakerphone - I never experienced the bug, and apparently it's been fixed in this build because neither I nor the person I was calling could hear it. Camera processes HDR+ photos faster (and lets you delete the ones you don't want processed too!)
Overall the phone looks leaner and feels better, battery and performance-wise. I am draining the battery today to see how it performs at the lower end but barring some disaster this definitely has gotten more life out of my Nexus 6! (Hopefully enough to make it to the Pixel 2 launch!)