There is nothing that any irate customer could possibly say to you that is more rude and abusive than Black Arrow's conduct and performance. Case in point, this completely insane article making incredible claims about future product lines, when Black Arrow isn't even capable of ironing out the most entry level serial communications systems that even an intelligent hobbyist can do. There is literally no actual shipment-ready product confirmed in the 28nm line (other than purchasing the ASIC chips themselves at reduced prices now that indicate some kind of quick liquidation) , yet somehow it's acceptable for the company to talk like this to the press and general public:

http://bitcoinexaminer.org/alex-berk-black-arrow-as-soon-as-14nm-is-available-well-release-a-new-asic-that-will-outperform-any-other-14nm-designs/