This is why I like having the controller in a virtual machine offsite. Factory resetting the router and pairing it to the same site in the separate controller gets me back to the same exact place I expect to be.

With the UDM series, the integrated controller ensures you lose everything if you have to factory reset, site to site VPNs have to be manually configured, and numerous other minor annoyances crop up (like UI.com not always being able to connect to the controller).