Pros
High-energy, fast-paced work environment from an operational perspective. Good time for career starters to help shape the company on their business practices and processes. Given the break away from PwC, alot of opportunities to make improvements or implement new processes. The Pros and Cons really are related to the Partner and Director where you are assigned. I cannot emphasize enough to ASK LOTS OF QUESTIONS. Although, you'll be given a sales pitch so read between the lines.
Cons
Like most major consulting firms, you are promoted based on the number of hours worked in a week (60+), revenue, and although you receive 15 days vacation/sick leave, your direct chain of command will require you to make it up for revenue. Their bonus, raises, and promotions depend on your slave labor. That's the hours over standard -- the amount of your vacation and holidays given. Benefits are horrible for a large company, as is the vesting schedule for their 401K. The higher up you are, the greater the company match (as if they need it) and the more vacation (as if they need it) because it's rarely taken. Your job IS your life so if this is not what you're looking for in a job, stay away. If you are a mid-career person, do not come in lower than a Manager.