Thus, not a good reason for a refund...

You knew difficulty was going up... It has never gone down... period. Thus, the reason is truly that "you just want a refund, just because you don't think you will make as-much." Truth be told, it has actually gone up less-fast than ever projected. It is going up fast, these are faster miners!

However, difficulty is actually irrelevant to the situation. Since it applies to EVERY single miner being sold, being made, and in the future being thought-of. With every new THs model added to the network, there are thousands of GHs units removed from the network. We are near a technical limit here now. We used all available magic to create these things. They are not going to get much faster now. Until Aliens develop new technology for us.

End of the day, this miner will make close to 12-25 worth of BTC-value in two years, and again, it does not matter what the price is now. It matters what the price will be when you "cash-out". What will value be in two years? (That is when the reward switches from 25 coins per block to 12.5 coins per block, and this miner will possibly not make enough to cover operation costs at the time, but still produce coins for the future-value still.) On a safe estimate, that would be about $1200 x 2 = $2400. On a real estimate, price is closer to $6000+. On a hopeful-high, it is more like $12,000-$30,000 on a "modest trend".

Assume the worst... $900 per BTC x only 12 BTC = $10,800 Which would be about break-even with power consumption. (Now you know why BTC is so stable at about $900 now. For the new guys, that is about break-even, for the old guys, they can still go as low as $600 obviously. But now they have cashed-out. Which leaves... $900 as a realistic future value.)

Truth of the matter is... You see BTC low, and you would rather take that money back, to buy more BTC. Wouldn't it be interesting if they only gave you back your BTC as the return, since that is what you paid them with. (But I doubt they would do that.) That is exactly why they protected themselves from pull-out investors, the way they did.

You have a chance for a refund, and even gains now. Just got to sell the thing you asked them to create for you, when you made the purchase, after it is delivered. I am sure you can get $12,000 for it, once it is sitting in your hands. I see people have sold BFL's $1,000 units as high as $10,000. So anything is possible.