Figured would share my feedback so far on brand new distributed install of R81.20 in esxi lab. I really do like zero phishing feature, though for that to work, https inspection has to be on, so may try that out some time this week.
In all honesty, I dont see any drastic changes from R81.10 as far as policy layout, log filtering, IPS...
Also, not sure if this is just my lab, but I made few rule changes and for some reason, accelerated policy push never takes an effect, though its not disabled.
Just my 100% honest feedback, looks good so far, but the real test would be to see it in busy production environment.
Anyway, thats all I can think of for now. Will add more things as I do more testing : - )