Pros
There are a lot of smart, hard-working people here. Very difficult to be bored because there is a ton of work to go around. Creatives get a decent amount of autonomy and control. They're always looking for more creative, non-traditional solutions. There's an open bar in the office, 24/7. They'll feed you lunch once and a while, and the kitchen is generally stocked with snacks/coffee. The office is in a great location, close to a bunch of great restaurants and bars. Great place for young people, who are willing to sacrifice most friend/family time for career. It's a young (somewhat) hot shop.
Cons
Terrible work-life balance -worse than the 9 other agencies I've been at. If you leave before 6pm, people in the office look at you strangely. Most weeks, creatives will stay two or three nights till 8pm. One or two nights till 10 or later (sometimes till 3am or something). In general, the communication and workflow is all over the place. Guidance by the account folks and CDs aren't very focused, resulting in a lot of time wasting. Also, there isn't too much chemistry amongst the staff. Everyone is so overworked. Work quality doesn't match ambition.