UNOPS has an employee rating of 3.8 out of 5 stars, based on 326 company reviews on Glassdoor which indicates that most employees have a good working experience there. The UNOPS employee rating is in line with the average (within 1 standard deviation) for employers within the Non-profit and NGO industry (3.7 stars).
Good salary compared to other employers, good international insurance, pleasant facilities, and accessible to many other businesses. It's a good organization to add to your resume.
Cons
The work environment is stifling. Colleagues can be very rude, it's very hierarchical, even though they say it's not, they're always looking to take advantage of you.