Devoidwind, if you honestly feel strongly about it then just buy the thing, try it out and tell us your findings.
For a number of reasons it simply isn't logical. Infinite lifeforms populating the Universe, black-holes everywhere, etc.
There might be a hundred snake oil salesmen but that doesn't mean they are selling something you should buy.
More practical than a free energy device, would be to find a novel way to tap into a large existing source.
Assorted planetary magnetic fields and geothermal sources would be our best bet. Plenty of more hypothetical sources out there though.
Wouldn't be truly free, certainly not free of consequences, but long lasting on a human scale.