I don't have any student loans, but my bf does. They just started letting him do IBR (they'd been in deferment? for years before that.) He's never going to make more than he is right now ...(he's 48 - went back to school at 38 and got a two-year business degree which he did nothing with.) When he talked about doing the IBR thing, I wondered about the interest racking up - but it sounds like they don't charge interest while you are doing IBR?? If so, that is good news!
(I was extremely lucky to make it through college and grad school with no loans. College due to my dad being a minister and the 70% tuition deduction +trust fund from a medical malpractice suit my mom won = grad school I paid for out of pocket from previous savings while living as cheaply as possible and working 25 hours a week, not to mention a good bit of scholarship money.)