Pros
The mandate , the ability to work closely with persons of concern, and some good mid-level technical people.
Cons
The worst leadership I have witnessed in 25 yrs. Internal recruitments, nepotism is rife, diversity at HQ is a question mark, senior managers are people who have never worked anywhere else and therefore have developed a horrible arrogant attitude towards all other stakeholders and believe they know best but havent kept abreast with any changes outside the agency. Many of them are horribly incompetent with serious bouts of 'savior complex'. Leadership is focused on their own branding and external communications. Technical areas suffer as have to report to incompetent managers. Dont work at HQ, go to the operations (after you have checked who your manager will be).