I think it's a good option but you need to do the math. I looked the same program when I graduated with my MLIS (master of library and information science), however, I was making quite a bit more in my first job (in public library administration) than I had anticipated, plus I had my DH's income, and figured out that by paying off my student loans ASAP, I would save as much in interest as would be 'forgiven' after 10 years of regular payments, so it would be a wash.
However, my sister is a speech language pathologist with a quite large student loan for grad school (about 4x what mine was but she went to a top 10 school) and discovered she loves working in public schools (originally wanted to be in hospital setting), so she got on the IBR payment plan and enrolled in the program (had her school fill out the form that shows she is eligible). Yes, it's possible the program could go away and she'll be on the hook for her debt, but at this point, she's just trying to save as much as she can and not go into more debt. She is young and single and doesn't make very much relative to how awesome she is at her job. :) Also, I think it's good that she's had the forms submitted already, so if the program is ever done away with, if there's any type of 'grandfathering in' option for those already on track to do it, she would fall into that category.