Hughs belongs on Saturday morning TV along with Ron Popiel, adjustable reading glasses and miracle wrinkle cream AFAIK.
They did not answer 3 separate USPS letters. I asked how many db isolation their product provided. The first letter prompted a mere BUY NOW offer the 2nd and 3rd were ignored. Voltage limit cutouts and misconnection cutouts are very useful but the gizmo is indeed a multi tap autoformer. I dissected one about 15 years ago that caught fire. My Sola + - 40% frequency regulated system has a 30 amp capacity with a FULL isolation transformer secondary. Bad part it eats 133 watts sitting on it's butt. But Hugh's is on my **** list for dishonesty.
I build whole house voltage de-spikers with gas tube lightning diverters, 10 20- mm MOVs and multiple TVS suppressors EACH DEVICE having it's own BUSSMAN micro fuse. The system is not cheap to build