Pros
People in the company are generally very friendly and collaborative. Some nice office perks depending on the office, team meals, weekly drink events, fun outdoor activities, etc. Company really tries to get people involved in the culture. Flexible with regards to scheduling, in that staff take their vacations and are expected to and can work out of other offices when traveling.
Cons
Not much in the way of career guidance. Although the structure is pretty flat (Partner or not Partner) there is no guidance given to young professionals of how they can become a Partner or move up the ladder. A lot of young professionals are confused as to how to progress their careers within the company, whereas at other organizations, there is some sort of title recognition or something of that sort. Most Partner level professionals have come from outside the organization (where they have made their money) and don't look to be making way for younger hungry professionals. Pay is well below market, but that's the price one pays for flexible scheduling and strong company culture. Like all organizations, there is politics but most of this is at the more senior level.