Pros
The company offers structures that give you the possibility of great flexibility - the standard hours can vary for salaried positions (with full benefits when you are scheduled for at least 30 hours a week), and there are other kinds of work status that allow for professional work with limited hours. Actually doing that, of course, depends on your supervisor and client. The nature of the work is totally dependent on the client, but there is plenty of satisfying and rewarding work, and there is usually a good deal of horizontal mobility.
Cons
The company used to be really fragmented. Senior management seems to be really focused on changing that, but I still sometimes see a culture that is focused on doing the best for one division. That's not always bad, but it does mean that project managers sometimes sit on people or resources that could be better used.