You can be angry and say basically whatever you like. However we don't like people who are rude and abusive.
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/Please contact me if you think you can solve the backplane problems. I will then discuss if it is possible for you to come solve it.
That's not how it works, we paid your company money to do it. So go and do it, instead of trolling your customers in this manner. Once you're capable of doing the job that your customers paid you money to do, feel free to go ahead and talk like this, otherwise you're just embarrassing yourself as an organization.
He's not trolling, BA has come on the forums, said the problem they have and offered to pay anyone who could solve it. You said that it was a simple fix, david is asking you to tell them how to fix it (don't forget you get paid to fix it).