If you take data security seriously, then you should definitely NOT be using a 3rd party VPN service. VPNs were designed to allow a remote machine to connect securely to a private network in order to gain access to resources on that network. A VPN was never intended to act as a middle man between you and the Internet at large. Sure, using a VPN when you're connecting to a public hotspot at Starbucks will keep someone at starbucks from sniffing the network and intercepting the traffic, but at some point, the traffic has to leave the VPN providers network to reach your actual intended destination on the Internet, at which point it is exposed again. Never mind the fact that the VPN provider themselves have access to all the data you're pumping across their network and several of the 'big ones' have been called out recently for not doing what they say they're doing... they were collecting data on all of the internet activity of the users on their service... web sites visited, content transferred, etc. Even if the connection was secure, they still had records of users that were connecting to illegal underage images and videos, for example and were able to identify to law enforcement who those people were and exactly what they did when.
Imagine what someone with that information could do if they wanted to... blackmail maybe? Pay up or we turn you over to the perv police.