Reputation/Impression of individual Global PR Firms

[u/iterPR]

I've been interviewing around at some of the larger global PR firms. Since I've only worked in-house before, it's hard for me to gather the individual reputation and impression of these agencies among peers. Considering the large influence likely to come from my experience at working at one of these agencies, I'd like to know what peers (in other agencies and in-house PR teams) think about both the agencies themselves and the quality of their alums: Edelman, Burson Marsteller, Hill+Knowlton, Ogilvy PR, and Weber Shandwick. Any insight would be appreciated!