It is a 3-interview process. The first interview was in my opinion an assessment of communication skills. Most of the info they asked about they could get from my resume, but everyone in the office is very personable and talkative and I got the impression that's a big part of their culture. It also included a simple personality quiz.
The second interview was a couple hours. I was interviewed by an account manager, which was pretty cool because I asked him a ton of questions. The campaign was for DirecTV, and the sale was pretty easy but I think they wanted to make sure I could interact with customers.
The final interview was a phone conversation with the Branch Manager.