Pros
Base Pay compensation, 403b match of %10.83 when you contribute 12%, generous vacation time allocated at 23 days, flexible work schedules, great technical development through MITRE institute with excellent education resources as well as tuition assistance program, great technical mentors in the field of your choice, satisfaction in supporting Department of Defense and and other government agencies, as a non-profit company the work is focused on value versus making a profit.
Cons
MITRE Corporation is very "Top Heavy" which promotions and recognition is harder to get. As a Federally funded research and development center (FFRDC), the manpower allocated is limited by congress which at times is hard to get additional staff to support the projects as well as the downside that needing to reduce staff to meet the staffing due to overburning or too much staff working on the projects. The issue with this is that because of the manpower limit, project cannot simply increase number of staff to support it without approval. There are internal politics that can really cloud the big picture especially when dealing with a government bureaucrat. Raises a nominal and moves inline with what the government receives.