Pros
Highly entrepreneurial company with a lot of potential for employee growth. This is a great company for someone who is hard-working because there are a lot of opportunities for career advancement. I started as a temporary admin and over the course of several years, was provided with the opportunity to learn new software and skills, and eventually a new profession. They always said, "yes!" when I asked for new tools, which was awesome. The President of the Midwest Region at the time (now someone different) was a huge advocate for employees having opportunities for career advancement. I also had a wonderful boss in my department for the majority of my time there who was also very helpful in advocating for me.
Cons
There was a bit of a "boys club" culture, and a feeling that the brokers were more important than everyone else in the firm (i.e. even the creative director didn't have an office, which is kind of ridiculous). I feel there was a lack of respect by some brokers for the support staff (not everyone, but a few). I sometimes felt like a second class citizen because I wasn't a producer.