A friend of mine has been using BlackVPN for a few days now. The price he got for a 3-month access was a steal. So far VPN seems to connect fine, but he has had some disconnects with OpenVPN.The exact cause is still unknown. PPTP seems to be bit more reliable, but OpenVPN is preferrable.
I might post another review in a couple of month, when having more hands-on experience with BlackVPN. Because of this please view my stars given as preliminary.You're welcome to share your experience with BlackVPN on my blog (just google for mylinuxmint9).