Pros
Used to have a great reputation, particularly under the previous brand. One of the best (and most difficult) graduate "training" schemes in the IT Industry - the gain is certainly worth the pain in the long term. If you get in - particularly in consulting - you'll be working with similar "A Type" personalities, some of whom you will be in conflict with, others will be colleagues and best friends for life. Depending where you are in the world, you may get opportunities to travel. If you deliver, get constantly good results, and "create" a position for yourself somewhere - you will make it. A great name to have on your CV.
Cons
... historically. Now isn't so good as the reputation of company going downhill fast due to major non-delivery of projects. Be very wary of those that have been "brainwashed" - very good salespeople. HR and Marketing very self-important and don't understand what its like to work "at the coal face". Expect to work very long hours, unpaid overtime, at weekends as "normal". Huge differences in morale, salaries, travel, benefits across the world. Snobby culture in Consulting against the other workforces. Be very wary of "large transformational projects" for "market leading companies" - these tend to be the most under-resourced and lowest morale among staff. "Oversell and Underdeliver" seems to be the motto at the leadership level. Does not value specialist staff - be prepared to be a generalist if you are going for career progression.