I'm using about 600 gigs a month on average.  I think I could hit one terabyte in a month if I really tried.  I pay the extra 30 dollars monthly to use the hotspot feature legitimately and make the most of my unlimited.   I'm away from home 5 nights a week so I dropped my home DSL in favor of the 4G and actually, I'm mostly using a wireless high speed cable connection on those 5 nights.  Thanks to T.D., an awesome, now private website, I never rent movies, (but I watch all the popular new ones in HD w/DTS on an Argosy connected to a big screen TV, about 2 weeks before the Blu Rays go on sale) nor do I subscribe to HBO, Showtime etc. even though I watch plenty of their series also.  I also upload more than I download.  Thankfully, the tower near my home does not seem to be congested.  None of this may last forever, but I'm enjoying it while it lasts.