Vantaggi
Good pay and good benefits. Fancy chairs, nice laptops and monitors, free coffee, free snacks, occasionally free catered lunches, and free open bar parties now and then. Huge referral bonuses if you refer someone and they get hired. Good place to work if you're not especially ambitious and don't mind doing fairly boring work day after day with uninteresting people.
Svantaggi
Doesn't feel like a meritocracy. Incompetent people benefiting from nepotism all over. Decisions made in secret behind closed doors. People are generally unhelpful and communication is scarce. Tons of legacy technology that is deeply tied into everything and will never die. Lots of process and red tape despite claims of the opposite. Extremely political environment - the only thing that matters for your career advancement and success is being friends with the right people. Your actual skills and knowledge are irrelevant.