Carpe Diem really has their stuff together as an organization.
My trip leaders were real pros and really amazing people, my group-mates were hilarious and fun, every place we stayed had a lot to teach us, and the food was for real fantastic. You definitely won't regret going on a Carpe trip.
I've been on a program or two, and I know what a bad program looks like. Carpe Diem staff are really on the ball, they know how to care for students, and my two months in Costa Rica gave me a better outlook at life.