I probably bought from them before "rush hours" (in early November) so your experience might differ, but I had no trouble contacting Black Arrow (to cancel a mistaken order and direct the funds which I had already dispatched to them towards another order with my name on it). I wasn't asked for any additional documents since I paid from my own account and ordered in my own name. The whole process took 4 days, but this included weekend.

(The need to cancel one order and use the funds towards another order resulted from my mistake. Unfortunately it demonstrates that even customers who generally do read the fine print occasionally make mistakes, and with running a shop comes the burden of having to support them. I realize it's difficult for a "mostly engineering" shop to support a lot of customers - especially customers who speak many different languages. I thus try to not bother them with excess curiosity.)

Hi, I just ordered 5 TH / s from Black Arrow 4 months contract for 12k USD, before paying I just want to ask you if anyone did it before and if you belive them?

This is my calculation to difficulty mining in BTC from March to July: If it would be true, this contract wil be in BE in month and next 3 months are ++

jump                           difficulty               Diff %
1 (on 2014/03/10)   4,583,606,945   + 23.7 %
2 (on 2014/03/22)   5,637,492,863   + 23.0 %
3 (on 2014/04/03)   6,895,940,103   + 22.3 %
4 (on 2014/04/15)   8,390,472,259   + 21.7 %
5 (on 2014/04/27)   10,155,944,787   + 21.0 %
6 (on 2014/05/09)   12,230,656,051   + 20.4 %
7 (on 2014/05/21)   14,656,427,398   + 19.8 %
8 (on 2014/06/02)   17,478,648,308   + 19.3 %
9 (on 2014/06/14)   20,746,283,038   + 18.7 %
10 (on 2014/06/26)   24,511,835,766   + 18.2 %
11 (on 2014/07/08)   28,831,271,812   + 17.6 %


What are yours opinions?

thank you