Vantaggi
Good salary and benefits as befitting a mega corporation. Siemens has some wonderful products and even better people, but the lack of communications from upper management to the employees stinks. Maybe this comes from the German background where you are just supposed to shut up and follow orders, but it makes for a less than pleasant work experience.
Svantaggi
Downsizing and believes in the mushroom principle (keep them in the dark and pile poop on them). Here you have great people and they are ignored. The constant specter of a division being sold or downsized demoralizes everyone. Then there is the little problem of bribes that has gotten Siemens in trouble around the world. That gets around to your customers and hurts credibility.