Pros
Good place to get your feet wet and become a expert on congressional procedure and politics quickly. Many interns over my five+ years there were hired full-time. Benefits are fairly generous. Staff who has been there a long time are smart, great at what they do and happy to teach others. Convenient location near Union Station.
Cons
Management is a mess. Some are entirely untrustworthy, some shouldn't be managing at all. Favoritism for new hires over employees with institutional knowledge runs rampant. It's impossible to tell if updates on how the company are doing are sincere. Promises of improvement are never followed through. Morale is very low on both the CQ and Roll Call sides of the newsroom, and both have had huge turnover in the past year or so. Most of all, management can't seem to decide what it wants, or effectively communicate that to staff. Pay is low if you start at the bottom and very hard to get increased. It's very easy to get pigeon-holed and reach a dead end.