Google

Great work environment, smart people, unlimited toys and food. Freedom, no nickel-and-dime mentality. Additionally, the word "Google" looks REALLY GOOD on a resume.

You might get allocated to a position that is below or mismatched with your skills. Since the majority of their software engineers are PhDs, there are many PhDs doing things you don't need a PhD for -- "flipping burgers". There is less opportunity for career advancement; managers tend to get hired externally rather than promoted internally.

Consider people's skills, background, and interests when allocating them. The free food, toys, and general awesomeness of the work environment eventually don't outweigh dissatisfaction with actual job tasks.