Pros
It's a good place to get a known name on your resume.
Cons
If you have any intention of learning anything or moving up, be wary of staff augmentation engagements, particularly in the federal space, where you will be warehoused and forgotten about while the rest of the firm enjoys the spoils of the customary "just short of the mark" annual revenue result. Be prepared to leave in 2-3 years when you finally realize, that despite your best efforts, nobody really has an interest in seeing you move up or grow. The promotion/compensation roadmap is deliberately ambiguous and overly dependent on the oratory and case-making ability of an individual who may not even work with you and/or even have your best interests at heart. If you are veteran transitioning from active service, understand that even if well qualified, you are mere window dressing to satisfy a veteran hiring goal. You are behind your peers who did not serve, or serve as long, and you will stay behind, regardless of your experience, qualifications and education. Yes, I am a vet. If you are a glutton for punishment go to another Big 4 firm, at least you'll be paid better.