Pros
Relatively good salary/remuleration/treatment comparing other Korean companies. The company is still not familiar with foreign workers, but changing fastly. It has several famous foreign executive people. Has more advanced, globalized management style and culture. Working in Samsung can give you further job opportunities IN KOREA.
Cons
Life in Korea is kind of question mark. Seoul is fantastic city, which is really dynamic and convenient, however life in Seoul is very emulous. Koreans tend to focus more on work than family; they usually over work, and even drinking after work with team is considered as a part of work. In this point, Samsung is not an exception. Raising kids is difficult even for Koreans; you will see almost every parents pay huge money for additional/private education, since public education system is kind of disaster. (But for foreign workers, I think Samsung will take care of this.) Historically Korea is very homogenous, so sometimes you can see religious/cultural/racial discriminations; not in company but in your social life. Difference between Seoul area and other cities is big; other areas far from Seoul is quite bored. All culture, industry, conveniences is concentrated in Seoul area.