Avantages
Experian generally offers fair pay and fair overall compensation. There is good flexibility in the work environment, meaning you aren't chained to a desk and a time clock (many, but not all departments). You are expected to be accountable for your work load, and like any company this may mean working long hours on certain projects. For many positions, an MBA will benefit you. Intelligent professional work force for the most part.
Inconvénients
There's a general lack of knowledge sharing. Departments / Divisions seem to prefer maintaining a silo environment, and on occasion can result in divisions undermining each other. There has been an ongoing theme of job off-shoring in many areas (not just IT), so jobs that aren't location specific may not be long term. They seem to have a preference for college grad aged prospects.