AU update installed fine here without any problems. I've been messing around with ZoneAlarm Extreme Security alongside ZAL (the beta where both AM and AL are combined) and they didn't cause any problems. ZoneAlarm itself (like many others) had support for the AU update before it was officially released for the general public - although ZoneAlarm seems to have updated to that version after AU was installed.
Some of the features I noticed immediately like improved sticky note (which I use heavily), a slight redesign of the start menu to include things like power menu (shutdown, restart, etc for ease of use), and the settings menu have a dark theme that you can toggle on/off in personalization under Color tab.
My only annoyance is that they reinstalled those apps like 3D Builder. I really wish they would stop doing that. Will probably do a fresh install with updated ISO in a few days or sooner if I encounter any problems.
I'm running the Windows Update. Everything running a-ok. Like Umbra I only run Windows Defender,no problem there running smooth. I noticed WD now has icon in the system tray now. I also have Malwarebytes Premium,Voodooshield pro, and Malwarebytes Anti Exploit Premium, all running great together.