I've been using them for a few years now, they've always gotten me where I need to go. Really couldn't expect more out of a free service, now I'm considering upgrading (both to support them and hope for better speeds!)
Four weeks ago, Using VPNbook to browse around. Few day later and received a blackmail in my outlook account to ask to put some money to a bitcon account; otherwise, my password and some personal info (including videos) will be shared to my friends that will be randomly picked. and activated the vpnbook again just last week and few days later received a different blackmail with similar content in my outlook again. Now I didn't use VPNbook and no blackmail received so far. I wonder if VPNbook can be trusted.
Overall the vpn is very useful for me, i definitely prefer vpnbook for everyone because of the speed and the anomalous bandwidth are great and are free of cost, the only thing irritating thing is they change of password often.