We never know how personal or safe it actually is. The business has been accused of spying on users (it denies the allegations), and complaints abound on the internet about Hotspot Shield application putting in on PCs without users' permission. VPNs never give privacy, with a couple of exceptions (comprehensive under).
If you're looking to entry US media sources like Netflix and YouTube without geo-blocking, then a VPN service with the bulk of its nodes in Africa and Asia is of quite little use