Pros
Large organization with many different career paths. Decent benefits. Flexible work schedules (but only to accommodate all of the nights/weekends/holidays you'll be working). Depending on your management, they may recognize you for going above and beyond...
Cons
Long hours. Poor middle and senior management. Very few leaders in the right positions. Hiring under qualified individuals for critical positions, which leads to additional responsibilities for those with ability. No understanding of project scoping... If you loose resources and/or new initiative come on line, managers must convey those circumstances to the customers and reset expectations... Otherwise, people leave in droves.... Management gets too wrapped up in politics, which causes delays and issues with projects...