I have been using BlackVPN for over a month now and I have really enjoyed it. When I first got a subscription there was an issue with my password and I couldn't logon to their server. They refunded me money after some trouble shooting yielded no results. I really wanted to get BlackVPN working so I bought another passcode and had it working first go. ( They said they had had a problem with password generating server over the weekend ). Since being online with BlackVPN I have been super happy, no drop-outs and the speeds been really good.
Give them a go, its a great service.