Pros
It gave me solid experience for a first job out of college. Everyone on the team is really friendly and open to questions. Many of them had done Americorps themselves or something similar and could identify with the experience and give solid advice. Their program is also fantastic and does have incredible results. It definitely helps to know that you're working for a nonprofit that actually works.
Cons
There were way too many times where I felt like I had nothing to do. My managers gave little direction in terms of our actual responsibility and had very low expectations of us. It was honestly really boring most of the time. I felt like since we were technically free labor, they didn't really care about making sure we were actually adding to the team. Plus, when we did have something to do, it was mostly busy work, or sending scheduling emails. The job posting made it seem like we'd have way more interaction with people when in fact we just spent the day staring at a computer screen and waiting for emails to respond to.