Pros
Relatively good benefits, very flexible schedule and option of working remotely.
Cons
Salaries are stagnant, way below market values. Even for those people who considered important, it's impossible to negotiate a fair raise. The culture is severely damaged by outsourcing to India. Most of the TCS people are incompetent and very hard to work with. Too many restrictions and very narrow range of responsibilities. A lot of time wasted on really ineffective administrative tasks and tracking of progress,etc. As someone who got to Nielsen by acquisition, i can tell that the range of my responsibilities and therefore access privileges is shrinking every day. If you are a sharp and experienced programmer/IT specialist, I would not recommend working for Nielsen.