Pros
Have great things to say about Edelman in the US - worked in NY and had experience working in many US markets - fair treatment, consistently work with smart people, good clients.
Cons
Edelman's mobility program is a nightmare and globally so are many of the company's offices. Edelman advertises mobility as one of its core means of career enhancement but unfortunately the experience for me and many friends of mine was a disaster. Anyone looking to transfer to the UK, watch out - there are serious challenges in that office, the HR department is nonexistent, and the salary bands are completely different (33% lower despite 20% higher cost of living from NYC). Edelman global does nothing to intervene to address this and leaves employees to navigate a completely different work environment with no support. So: Edelman is great if you are sticking with the states, but if you have aspirations to get global experience, be really careful.