Great companion to the VPN service. You can easily see that you are connected to VPN and to which location, and control the service (connect, disconnect, change server, etc.).
This is especially useful if you need to cross location barriers and/or surf the net on public areas: when I travel away from my home office/network, I set the add-on to connect the VPN when I start my browser and free my mind off it).

It keeps me connected to the UK when other cannot. worth every penny.