Pros
Average IQ and level of education in the hallway remain very high. Medical, retirement, and tuition benefits (esp. retirement/tuition), though no longer in the highest tier, are still in the top half or third of defense-industrial employers. Pace of life is slow and gentle, to the point of potentially loafing yourself out of a job, or failing to keep up with trendy buzzwords-du-jour, or simply watching your project funding disappear like a game of musical chairs. Roots of the advisory mission are "important" and "noble."
Cons
Some sea change occurred in the mid-to-late 2010s -- never widely publicized, something possibly like "McKinsey/Bain/BCG consultants told MITRE its business model was dwindling, that age, costs, and available govt appetites would make this model non-viable by ~2030" -- ever since then, senior leadership has been frantically pinwheeling through let's-try-private-sector-biz, let's-try-cheaper-college-campus-hubs, let's-try-junior-DevOps-projects, let's-try-a-different-logo, let's-try-VC-spinoff-alliances. The new experiments are not faring well. The trusty reliable old business is also not faring well, due to de-prioritization, or overarching demand factors, or both. It's not clear where MITRE will turn next -- back to its 1980s Cold War competency, forward to some Hail-Mary entrepreneurship, possibly even divestiture?