Who is their Design House, Who is their FAB, Where are the miners assemble, where is their factory, Who are there? their background and linkedln profile?
Several of those questions go deep into "secret sauce" territory. I honestly don't think they're under any obligation to detail that - largely because it's irrelevant, but also because it is incredibly dangerous to dish that information out. A company background can be fabricated nonsense, and a LinkedIn profile is certainly no measure of legitimacy.
That having been said...as has been pointed out, there are several forum members in the vicinity that can go through and look at the units (I'm in South Africa, otherwise I'd volunteer;) and these guys don't seem to be as cagy about visits as BFL. I second the request for more pics and videos for those that are too far away to visit. Their openness with regards to their physical address and phone contacts also open them up for a legal pounding if this is a blatant scam. Right now I don't think we're in "if it quacks like a duck" territory.