This thread brings up a good point - when something says "unmetered" the first thought in your mind needs to be "What is the port capacity?" and the next "Is that dedicated to me or shared between who knows how many other customers?"

A handy tool to figure out about how much bandwidth you can get in a month out of a connection is to use Google. Ie. Search for "1 megabit per second = ? gigabytes per month" and it will tell you. Don't forget the real usage you will end up getting out of the connection is likely a lot less than what Google will list as your peak usage will be a lot higher than your average usage.