Vantaggi
Good infrastructure for the most part. Salary is fair if you negotiate it before hiring. Large international company means there should be lots of opportunity.
Svantaggi
Company has more than doubled in size in last few years due to mergers. That means that there is a constant reassessment of practices and changes in procedures. Almost every system you learn will be replaced with a new one within a couple of years and they aren't always for the better. Heavy emphasis on billable hours, so conduct yourself accordingly if you see chargeable work drying up. Unless you have a mentor/manager that likes you and has the pull, you are a liability when they aren't making money off of you. That is just a fact of life in the contract business.