Pros
Pay is outstanding. The security group is fantastic - the senior leaders in that group take the time to get involved in client work & mentor younger employees. If you're applying or interviewing to work in the security group, by all means, go for it and you'll be a much better PR professional for it.
Cons
Churn & burn. The senior leaders have all been there for too long & don't take kindly to new ideas. Everyone at the level underneath VP is there to be run into the ground and replaced with a fresh face. They'll feed you junk about "work/life balance" and how much they care about their employees, but then you leave after 4 years and not get a single "Thank you" from anyone in charge, and you realize that you've basically wasted your life with people that don't care about you.