I'm actually signed up onto that package three times. It is undistuputedly overselling, but I have run up to 60gigs in 1 months without a single problem. To be honest it was file sharing, but it didn't cap out and seemed to work 100%. The only thing I can say is that it is not 75gigs a month, but rather 2500megs a day, which allows you to move your entire hosting package in one day.
I've had a good experience thus far and will continue to host www.playbypostrpgs.com/realms with them. I know this site is small and insignifcant, but I use the package for "other" purposes (totally legal of course *smile*).
Regards,
~Equinox