They're really doing some pretty important stuff. You look at what's going on in Argentina and CIPPEC is one of the few voices of rigorous analysis in the country. Their reports are consistently more reliable than government reports.
Cons
I didn't really get to do much at the internship. Got few-to-no life skills, and really didn't come away thinking as though I had gotten anything out of it. They don't give you nearly enough responsibilities. I think a previous intern had complained about a high workload and they seem to have overcompensated.