Pros
Generally highly qualified and intelligent staff - a pleasure to work with. Flexible hours are a plus if you want them. Benefits are on par with the industry (whatever that is - Leidos gets lumped with other similar large broad-based consulting firms even though they aren't all that comparable). Decent corporate concern for work/life ballance, although the pressure to maintain billability conflicts with that at times.
Cons
Substantive training for job enhancement is virtually impossible to get approved, or if it is, most of the time involved is on the employee, not the company. Only a few "high flyers" get training and opportunities to interact with management, but it is hard to see much benefit for the employee pool as a whole. The company has gone downhill since I started in 2007. What used to be an upbeat team is now hunkered down waiting to see what will happen after Leidos split from SAIC. The combined company was a hodge-podge of businesses, many with very little in common with each other, and Leidos still is to some extent after the split. A new CEO has a chance to sort things out and looks promising, but no one knows what bits are going to get trimmed, so the uncertainty weighs heavily on morale.