Vantaggi
Lots of great people with a varied backgrounds and experience. Depending on what level you're at and department you're in there are opportunities to move around within company.
Svantaggi
The culture there can be very off-putting. They have their Mars values but the management doesn't really live up to them. There are no offices (not even for the President), but they make a huge distinction between exempt & non-exempt employees to the point of it being degrading to the non-exempt employees. New high level employees will be nice to everyone until they figure out what level you are and then they often quickly change their tune when they realize you are beneath them. The interview process is utterly grueling and hiring managers often only want people from their own alma maters. They are highly discriminatory against keeping and hiring older employees and only want new/young talent.