Pros
Big brands, name recognition, solid benefits. Generally speaking, you'll work with people who really know what they are doing.
Cons
When I left, I realized just how mediocre of a place Edelman is. Offices battle with each other over clients and revenue. The various office do little to no sharing of information, skills and resources because of this. Edelman is also a highly matrixed organization, with lots of vertical specialists, but these people infrequently are asked to step out of their comfort zones and try something new. As an organization, Edelman's primary focus is revenue and profit, not client and employee satisfaction or the work. Management frequently promises work to clients that cannot be delivered. Compensation is well below industry standards.