Pros
Fairly standard benefits. Good PTO, OK health, OK 401k match, OK salaries. Good work-life balance. There are ample opportunities for advancement since half of your co-workers will be lazy dullards while the good ones leave for better pay.
Cons
Half of your co-workers will be lazy dullards and the good ones leave for better pay. No bonus for non-management employees, annual merit increase is poor (negotiate a good salary on the way in), they slowly slash a benefit here and there annually then try to sell it as a NEW EXCITING DIRECTION. Your experience at the company will depend entirely on what contract you are working under and how competent program management is on that contract. I work on a good contract now, but came over from a completely awful contract where we struggled just to get office supplies.