Pros
Friendly, relaxed atmosphere. Not drastically affected by economic trends and not controlled by stock owners. Can be affected by major weather, natural disasters (hurricanes, brushfires, earthquakes, etc). A company many people stay with for the long haul. Many accounts of people leaving for other "opportunities" only to return. Large corporate environment offering many, many opportunities for different jobs, career path. Excellent well-funded retirement plan. Modern IT campus. Need to work overtime rare.
Kontras
Extremely conservative company that tails the fortune 500 in workplace changes. Sparse vacation offering, average benefits. Implemented a casual dress policy Dec '07. Weak 401K contributions. Does not recognize same-sex domestic partner benefits of any kind. Slow to recognize, acknowledge workplace trends, customer segments, minority/sub-cultures. Implementing major projects usually like running through molasses while repeatedly slamming your thumb with a hammer. IT workforce a combination 30% very talented, competent tech, 30% housewives, and 30% incompetent "yes men" in financial holes so deep, they are stepping on each other climbing the corporate money ladder because they had one too many divorces and/or "oops" kids that they suddenly realized will need (a) alimony and/or (b) college educations.