Pros
As many have noted, so many of the people who do the work make this agency what it is. Like any other agency, there's a relaxed dress code, several company parties per year, good life and culture benefits, and an open office that extends to leadership. No CEO or other lead has an office, and everyone is out on the same floor working.
Cons
There have been some toxic hires at the team leadership level. Across most practices and teams, crying in the office is a common experience because of the workload, treatment, or way cliques form across the agency and then do underhanded things to try and protect one another in the quest to get ahead. As an example, I tried to escalate feedback to HR about my manager, who was a department head, and when that department head found out, pulled me aside to scold me. I ended up in tears. Life is too short to have that kind of workplace environment be where I go day in and day out. Equally distressing, the 'specialty groups' within the agency that pertain to creative and digital are treated like vendors, mostly because the agency doesn't have expertise to understand the disciplines. This is an old school, traditional PR shop fumbling its way into the future. There is a lot of creative work to be had if you're in media relations or client management. If you're looking for innovation, this isn't the place.