Pros
Salaries and benefits are extraordinary if you are located in a South American country office. As part of an international organization you get retirement plan and medical insurance based in US. It´s a job to stay if you are after a career government-related. Work climate is fine, there is no aggressive pressure to achieve goals as in private sector.
Cons
Retirment plan based in US becomes a downside if you are planning to leave after a few years (you get your money back but you´ve been "out of the local system" not adding working years towards your local retirement). Local offices still keep a number of "dinosaurs", people who have been there forever and made a career based on seniority, not capacity. Local offices tend to be administrative sites, the fun of the business seems to be taking place in HQ. If you are an adrenaline addict, you´ll feel like you are just watching a parade and miss the roller-coaster experience of private sector.