I try to buy something from Nabu Casa once a year or so (in addition to the cloud account) to help support the project. This year, I’ve upgraded my ZBT-1 (which I bought when it was called SkyConnect) with a ZBT-2.
It just arrived in the mail about an hour ago. Within 10 minutes, I had it connected to my HA box (a Yellow), clicked the buttons to migrate my 40-device network to it, and … nothing. Everything just worked. No drama, no crisis.