You can learn a lot about different computer systems - Anonymous employee CIA Employee Review

Great travel opportunities, and unique opportunities to do things you wouldn't get to anywhere else.

Long hours, and invasive security screening process.

Lots of really smart and passionate people. Some teams are really interesting to work for.

Most people are thrown into a random-ish team when they first join, which can sometimes be a poor fit. It's really hard to move around to different career services. Some teams are really slow and a lot of people are self-important and difficult to work with. If you get bad management, you'll hate it there.