Neither the OP nor the link clarifies the "class war". Who's fighting it?
But while the concept has merit, a quoted output of "between 300 and 2,500 kilowatt-hours (kWh) annually" is pitiful in comparison with typical solar-panel domestic installations. Taking Sydney as a sunny example, "a 5kW solar system [on a typical house] should produce, on average per day over a year, 19.5kWh per day" [based on Clean Energy Council Guidelines].
That's nearly 3 times the quoted maximum for the new-fangled jobbie that can hardly be quieter than a solar panel.
