Firstly... simply due to the facts others have mentioned already, this is at least 95% chance of being a scam.  In addition, if you simply consider their claim of 400 Mh/s on only 850W, that essentially locks it as a scam.  Think about that for a minute... they are claiming that this unit will produce the same hashrate as 2.5 6-rx 470 rigs, but at the power draw of just 1 of those rigs. Sound too good to be true?  Exactly!

And I know this has been mentioned already but just contemplate what pre-paying $3k 3 months in advance means... ESPECIALLY for ETH!  Even if you ignore the pending move to POS (which you shouldn't), just consider what the exponential rise in ETH difficulty is doing to mining returns!  At this point in time, it takes about 600 Mh/s to mine 1 ETH per week.  In 3 months time, that's going to be much closer to 1 ETH per MONTH, if not worse due to all of the new Vega GPUs that will hit the market between now and then.

So, that means best case scenario, this 400 Mh/s unit will mine you .67 ETH per month upon arrival, and go down substantially every month after that.  Even if ETH goes to $500 by then, you are looking at an impossible ROI scenario.  It is most likely that ETH will only be minaeable 3-6 months at most after arrival of this unit, so at max, you MIGHT be able to mine up to half the cost of this thing, and that is being VERY generous, and assuming almost 2x rise in ETH prices. If it were to stay around $300, you wouldn't even recoup 1/3rd of the cost.  Now yes, there are other coins to mine after ETH is defunct, but the whole point of this is that them marketing this as an ETH beast is simply nonsense and goes to further prove this is a scam.

If you have $3k to burn, why not just buy 10 ETH right now with it? Then, if it does go to $500 be end of year, you will have yourself a $2k profit, instead of a $2k loss ;-)