Avantages
Pay is fair and at market rate for location. Benefits are far above what smaller companies offer in the DoD space. Being a 501c(3) company means no knee jerk "Quarterly" thinking -- long range business planning and investment can, and does, occur. The company has a diversified business base which allows some flexibility in new assignments. The company has won, and tries to win, long term contracts. The company management I worked with at Riverside is the best I've had in the last 10 years.
Inconvénients
Majority of work population is embedded at customer sites. If the customer is good and sane, you'll have a good work environment. If not, the company will listen, but can't do much. Contracts come and go, but transition plans for when the contract ends to move good employees doesn't happen or happens in the "11th hour" and is rushed and not well coordinated.