KeepSolid's online service deserves a 5-star rating…
I purchased a lifetime subscription for KeepSolid VPN Unlimited 7 years ago and had haven't used the service until recently. However I just forgot everything from registration on and contacted its customer service about seven days ago. To my surprise I got a response by email quickly from Mr. Maria Polis. She helped me with a great patient and almost instant response to retrieved my account. I haven't quite met such a great online service - quick, responsive and right-to-the-point, and am grateful for her help.