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.
One of the days of the Russian government's unsuccessful attempts to tighten the internet censorship, my company started to have difficulties with the corporate google mail accounts. It took me about 2 minutes to setup the free vpn connection and continue to work, despite of the fact that I had zero experience in managing VPN. Great!
I started using VPNBook before I decided to go for Private Internet Access, and I rarely had any problems with it. Speeds were good and setup was easy (except that they change the password every so often, so I would have to go to their website, find the new password and change the credentials in OpenVPN.) The one problem I had was difficulty connecting to some servers from my PC. Occasionally it wouldn't connect over PPTP. But other than that, it's good for people who don't want to spend money on a VPN.