Pros
Everyone is quite friendly, and the bosses are ok. They can be a little bit difficult, I've been told off but I've never been scolded for my mistakes. They will just ask us to fix them. I've been in agencies where I hear screaming all the time hence I think the management is generally nice. I haven't had crazy hours, latest I've worked till is 8pm, which by advertising standards is pretty good, and I start work at 1030am! I haven't had to work a single weekend either, which is refreshing. I guess there are people who think advertising is a 9-5 job, so it upsets them when things don't adhere to their ways.
Cons
Salary can be a little better, and there were a few toxic people in the agency. Fortunately they were asked to leave. Management can be too involved in the work, and they need a lot of convincing before they buy your work.