Pros
Working at Arcadia provides a great deal of opportunity. Entry level consultants come from great schools and backgrounds, and much of the leadership team has been with the company since it's inception. There are very few deterrents to career growth, and aggressive new hires can find themselves with a great deal of responsibility quickly if they choose to take it on. The culture is young and open, and many of the consultants are friends outside of work.
Cons
Like many consulting firms, the side of Arcadia seen can vary from project to project. Depending on who your client partner or project manager is, you could have a even work life balance, or none at all. The openness of the culture permits much visibility into the executive level and affects the moral of the entire firm. When leadership is uncertain, the feeling pervades the entire company, as everyone quickly becomes aware of their uncertainty, from entry level on up. Finally, Arcadia is loosely structured; career paths are fairly non-existent. If you know where you want to go with your career, you may be able to get there, but those without a clear career path in mind won't advance.