Pros
90,000 employee workforce and organizational gaps create great opportunity for advancement. Initiative is rewarded with more responsibility, sometimes more than you're ready for. Many great groups to work for all around the globe.
Cons
CSC tends to be a 2nd tier IT company, but is actively trying to change that. Nevertheless, management is generally a couple steps behind industry leaders, salaries are usually at or below market, employees are usually second tier, and technology is just as good as what customers are asking for (not much cutting edge). CSC has grown by acquisition, so there isn't a worldwide corporate culture. Your experience at CSC will vary widely depending on where you work, so base your decision on the particular group you're trying to join.