Please keep in mind by the time July is here, nvidia will most likely have already launched the new maxwell chips with superior efficiency. Factoring the time lost and increased difficulty, it is hard to justify this purchase since it is blanketed with uncertainty and no guarantees.
What is sad is that Alpha-tech is already acting like Butterfly labs. They priced their units at only 10% lower than the price performance of 7950s or 290xs. KHs/$ is 2.5 for GPUs and only 2.8 for the 25MHs units.
Bast on the maxwell chip speculation and anticipated bandwidht plus the new DDR RAM step up will mean that GPU KHs will out strip the KHs/$ performance of current GPUs but a conservative 50% and possible even 75%. This means that the AMD GPUs will wipe out the alpha-tech units after only about a month after deployment. Not even enough time for alpha-tech customers to break even.
Wait till the AMD GPUs start getting out into the wild. Alpha-tech preorder buyers will be screaming for the shipments to get delivered and there will be frantic selling of the units on eBay hoping a sucker will buy them out at just break even.