It would be helpful if sense alerted users to a significant difference in the voltage of the two mains.
Our neighbor (not yet a sense user) ran into a problem where the voltage of one main was decreasing over several weeks. The first symptoms were erratic behavior of electric devices in the house. An electrician was then called, the voltages were measured and one was found low. This voltage continued to drop over the next week or so. Eventually when it dropped below a certain level the electric company classified it as an outage and worked late into the night to repair the feeder.
Drama could have been minimized if sense reported a main imbalance. (And my neighbor had installed sense)