tlesp As the others have said, it's not unlimited data, it's not sold as unlimited data, and the description clearly says what it is, so there's no one being ripped off, unlike so many other companies who sell a package as unlimited and then hide the limits away in confusing T&C's.
The always-on bag should be thought of as an 80Gb bag with a bit of leeway to see you to the end of the month when your new bag kicks in, that's what you are paying the extra £5 for, that safety net that means if you don't notice when you go through the 80Gb you don't start burning through airtime credit at per Mb rates.
