I just started using an internet service that allows me 10gigs per month. Before getting the modem, I searched the Apple App Store for something that would help measure my daily bandwith usage so that I wouldnt go over my allotted gigs. I found this app for FREE (cant beat the price) so I decided to give it a try. It automatically intalls in my top menu bar, gives me a constant read of my bandwidth usage in realtime and you can also save a CSV file that gives you a data flow chart of your daily usage. Great little app and thank you Harold Chu for your work.