Pros
I'm always proud to say I work for Booz Allen. In my 2 years working at BAH I have had very good experiences and at time when most companies are laying people off and cancelling holiday parties BAH is still going strong. I find that the morale is usually high and my BAH collegues are all high achievers. I like the 360 degree review process, where not only your supervisor reviews you but also your collegues and clients. We are also evaluated on how we give back to the company (although some may think this is a con, because it would require them to do things outside their normal work day). I have always been a believer that what you get out of something depends on what you put into it....and this is exactly what BAH is about. BAH gives the opportunity for an employee to name their own price, to name their own level.
Cons
Booz Allen is not for everyone. There is a certain "fit" for Booz Allen. From what I've seen, people who don't fit in with the core values of the company tend not to have a very good experience. Employees that do well here usually like a challenging work environment and like to participate in the extra-curricular work and activities, social networking events, brown bag lunches, training opportunities...etc