Vantaggi
Great exposure across a wide variety of analytical methods, policy areas, industries, etc. Unparalleled professional development investment into recent college grad hires -- I didn't fully appreciate how rare this was until leaving, but senior staff at KBR care deeply about helping junior staff employees grow as professionals (certainly much more than is evident at other consulting firms). Also lots of opportunities to "play up" a level and contribute to work above your role purview. Excellent company culture and camaraderie.
Svantaggi
Workflow silos can limit visibility across practice areas, although this may have changed in recent years. There tends to be a natural ceiling around 3-5 years before junior staff often leave for grad school (not necessarily a con depending on timeline)