Pros
Some of the long term managers are very good and work will be relaxed and your work life balance will be wonderful.
Cons
Some of the managers come from hell and micromanage you to do FAANG level work for horrible pay. Your mental health and work life balance will suffer. Nielsen does not care about diversity, regardless of how much they promote it. They will target you in a layoff if you are disabled or you stand up for yourself The outlook of the company is extremely unstable and unless you get lucky enough to be under a great manager your experience here will be miserable for a laughable salary. Even if you are under a good manager, Nielsen has reorganizations every year and will either lay you off or put you under a new manager. The process is destabilizing and they expect you to keep producing as though nothing has happened.