Interesting.
Jump on it if you can. Unlimited data is the way to go going forward. People don't use much data now, but in the future when there are apps we can't even imagine yet and all media is digital, everyone is going to wish they had an unlimited data plan because 2 and 4GB aren't going to last you long at all and you will end up paying for a higher tiered plan that costs more than what your unlimited data plan originally did.