Alas, save for one exception (not relevant here), EVERY 'energy savings' product I've ever seen has been far, far less effective than the 'simple math' promised by the sales propaganda. The promise to save a dollar usually turns out to be a nickel- or less
The first issue is that there has to be a problem, before you can 'fix' it. Very few electricians have either the expertise, or equipment, to quantify power supply issues.
Next is the matter of having a true, 'double blind' test. Trust me on this: if a firm spends big bucks to 'save energy,' the message will get out, and peoples' behavior will change. We have no way of telling if the savings are the result of the magic box, or the changes in behavior.
Finally .... despite all the very real "Cindarella success stories" we hear .... the Apples, the Polaroids, the Lears .... you can be sure that the major manufacturers are not paying their acres of design folks to sit around, debating what shade of gray to use on their switchgear! That the GE's, the Eatons, the Schneiders all manage to consistently overlook such a promising product ought to be a major 'red flag.'