Thoughts on the SAVE plan?

Somehow, I'm just now learning about the SAVE plan from a conference I went to through my new public interest job. My monthly payment is pretty high, and being able to lower it while still contributing to PSLF seems like a win win. I feel like there has to be a catch, though. Anybody signed up for the plan have any thoughts on it or tips? I did a lot of reading about it and I'm frankly still a little unclear as to how the government subsidy regarding the interest works.