I am running Unifi's controller to handle 2 APs and 2 switches at my house, plus 3 APs, 3 switches, and a USG that are remote (at my parents' house). I currently run the controller on a Synology ...
I have a gen 1 Cloud Key that is over 5 years old at this point. It has been consistently temperamental with the apparently normal inability to survive hard reboots, filling up the disk, corrupting ...