Vantaggi
Work/Life. Most of the people that work there do so because they live close to the headquarters, and are working themselves into a nice little rut. They have no plans on leaving, ever. The company's official hours are 8:15-4:30, at which time, it's like a parade out the door. You will probably never work overtime.
Svantaggi
Same as the best reasons. They don't hire go-getter Type-A's. Work is boring and mundane. Low morale across the board. The people who have been there for ever are very protective over their positions. The back-stabbing and undermining is ridiculous. You want to get promoted? Never challenge your boss, and do all of his/her 'dirty work'. That is, start fights with other departments, rat out dissenters, and then yell at them when your boss tells you to.