Pros
Very flexible telecommute policy (although my calls start at 6 am and don't stop until 10 pm). My managers are awesome, and I love my teams. Teams are a hybrid of the old acquired company (where I come from) and Nielsenites. I actually really love my job, but I also have a unique position that was created specifically for me. Easy to get comfortable. Lots of team building (if you can spare the time). Happy hours fairly regularly. Fairly progressive company, at least in my unit. Actively hires and promotes females and minorities from within (all thought the opportunities are few and far between).
Cons
The idea that Nielsen can compete in a tech-centric world is a joke. Everything is run on Internet Explorer. Seriously? IE? Off-shore tech support is basically useless. My company was acquired three years ago. Zero on-board or integration training. Disorganized and lack of central focus. I have no idea what 90% of Nielsen does. Business units don't collaborate, and sometimes compete with the same clients for projects. Growth in my business unit is limited. I'd have to jump ship to move up, but given that our business units are not all aligned I would basically be starting over as a newbie. Upward and lateral transitions only really benefit senior management. Benefits package is really disappointing compared to what our previous company had.