Notbatman:

- On BlackArrow all I know is I bought 100 units from them and they refunded 2/3rds of my money when I asked them (they were no longer profitable and they had some shipping delays) and they didn't have to do the refund but they did. They shipped me approximately 40 FPGA miners which worked great. Since that time I have no idea what they are doing. The experience I had with them went well. So Yes kudos to them for that.

- On KNCMiner. I bought around 40 units from them (actually did the very first pre-order with them or at least this is what they told me). Didn't get a single one. It is a long story but to say the least I wasn't happy with the ending.

You may and others may have had a bad or good experience with either of the companies. I am just relaying my experience with them.