A simple but effective replacement for the Sandmeyer reaction. The avoidance of diazonium salts, copper, and the general functional group tolerability make this deamination reaction extremely valuable for late stage functionalization strategies. Initial testing in-house would suggest that the observations are reproducible and scalable on complex substrates. This is a valuable addition to the chemistry toolbox, and complimentary to other displacement approaches as dictated by substructure tolerability and building block availability.
The only criticism would be better reporting of reaction temperatures in the figures per each substrate (they are reported in the SI) -- naturally the lower temperatures are more desirable. Overall a great paper with consise results and honest reporting of yields and limitations.