My school, Purdue University, has been making a big push towards IBR. The biggest issue with it I can see, is that, as far as I can tell, there's no cap on the money collected. That is to say, if they take 15% of your income, and you end up making lots of money, they will continue collecting their share past the actual cost of college. It honestly makes me feel like they see me as an indentured servant, not a student.