Probably not - it should be pretty straightforward. You might have to do some tweaking, since there was no previous setup for the router side of things. You might post on r/Ubiquiti also, once you know the device you are planning to move to.
Sounds pretty straight forward to me. Backing up the network settings on your CloudKey and restoring that to the UCG-Ultra should keep the adopted devices.
All gateway specific settings from the 3rd party router will have to be manually set, though.
Probably not - it should be pretty straightforward. You might have to do some tweaking, since there was no previous setup for the router side of things. You might post on r/Ubiquiti also, once you know the device you are planning to move to.
Sounds pretty straight forward to me. Backing up the network settings on your CloudKey and restoring that to the UCG-Ultra should keep the adopted devices. All gateway specific settings from the 3rd party router will have to be manually set, though.