Pros
The IMF provides great benefits such as home leave allowance and education allowance for foreigners (G4 visa holders). The staff is very diverse. Organization offers an amazing Defined Benefit Pension plan to staff hired on term and open ended appointments. Term appointment = 3 years and option to be renewed for 3 more years. Open ended appointment = for life, you are only fired if you do a major screw up.
Cons
Best career opportunities are for economists while other professionals will encounter fewer opportunities for mobility, growth and promotion. HR rules are very rigid and even stellar performers will hit roadblocks and glass ceilings before getting rewarded (i.e., promotion) for their hard work. Newly hired staff is 3 to 6 years of probation and, at the end, few will be converted to open ended positions. The job security that comes with an open ended position affects people in different ways: some will become too comfortable with the security and lose interest in self development.