If this is the technology I think it is, it's a total scam.
In the 70's, a circuit came out of NASA to decrease the waste heat on grossly oversized motors. It found an application in the clothes industry, where the motors ran constantly, but the load was only occassional. Ta-da, the 30%+ myth was born.
The circuit kept being "reinvented" with microprocessors, etc. Of course the inventors would present this miricle technology to the appliance manufacturers (to managament, of course), and as a young engineer, I got my turn to test it and demonstrate that contrary to the invenor's opinion, it substantially degraded to performance of any near optimal design.
Funny enough, we kept a file on these attempts over the years. It had all the test results and consistent failures.
PS, what's in the box? Well, it's usually been a light dimmer circuit with some means to control the phase angle that it switches on.
Mike