No issues straight from Preferences/Software Update.
2 Reboots total, 23 min total, full auto-pilot.
1st Reboot to Installer Preboot
2nd Reboot to Prebooter (@12 minutes)
Straight to OS X Log-in (@23 minutes)
Cleanest Install yet
Must now find wood to knock on for many weeks on end
This update was very fast on my machine. No problems.
i9-9900K, Radeon 64 Liquid Cooling, AORUS Z390 Master, 32 GB G.Skill 4000MHz RAM, Samsung 970 PRO 512GB.
Kext and Clover like on the previous macOS 10.15.5 update:
Lilu 1.4.5, AppleALC 1.5.0, Whatevergreen1.4.0, VirtualSMC 1.1.4, USBIjectall 0.7.5, Clover 5119.
Hide Preboot and other partitions in the Clover Plist. Always select "install macOS something" and then your macOS main partition.
I did not update Clover (Currently running r5107) or any 3rd party Kexts (Currently on the 1st June Lilu point release).
I kept all 3rd party kext's installed in /Library/Extensions as I have done for years with no problems.
Update took around 20 mins on both machines with the usual three reboots.