Pros
Salary and bonuses are competitve for the position. Direct management (and 1 level up) are very proactive in work life balance. Telework 2 days/week for good staff. Stable environment due to strong government contracting. Opportunities for getting into other types of work are good if you'd like to get into proposals, management (project and program). IT strong.
Cons
Depending on your niche, promotions (if that's what you're after) are hard to come by. Senior management (3-6 levels) may not always know what you do and getting into interesting commercial work is essentially non-existant. Even though it's an IT company, satellite sites (under 250 people) don't get their own IT staff which can cause delays in fixing computer issues if you're not as saavy as others.