Having access to a VPN can be really useful if you spend a lot of time online. It can provide privacy and security, especially when travelling using insecure Wifi hot spots at cafes, hotels and airport.
They also can be used to bypass the myriad of blocks and filters that are applied to the world's best web sites. You can use a VPN to access BBC iPlayer, ITV, NBC or Hulu from anywhere in the world for example.
There is one caveat though, a slow VPN is pretty much useless, Many of the VPN services online are overloaded and badly configured which means they run painfully slow.
This video shows a quick test of my preferred VPN service, but you can use the same to test any available online. It's best to sign up to a short term or trial account first and then check how fast your VPN service is for you.