I've read some reviews that ordering a 2nd Nüborn can have some benefits.
The first new feature we got on BOTH models was synced alarms! Why? It was already most hated feature on a stand-alone setup.
Also, their communication system between the models is a VERY noisy ad hoc wiresless audio mesh network.
(I have to admit it works better than our Wifi across the apartment – but I guess it’s because there’s no legal TX Watt limits!)