Finally my CC company refunded my €6,000.00 downpayment on 3 Vipers...
AT first disputed the chargeback, but they didn't give any more bullshit, as it became more and more clear over time that there will be no deliveries this year.
Took a while, paid in January and March, asked chargeback in July and 5 months later it was granted.
Luckily I was smart enough not to pay a single penny by wire transfer, and I will never pre order any crap again.
However, even if current miners would drop 90% in price, they still won't ROI, so I stay out of the mining business altogether and stick to real currency...