Pros
The Cafeteria is AWESOME and CHEAP! Sorta like their fashion. It's not that hard to get a job at Headquarters SINCE they are ALWAYS hiring. and firing and quitting.
Cons
Working at headquarters can be ridiculously ostracizing for someone who is not into socializing with the department they are in. Art-y types tend to stick together, as does HR, and every other of the 3 dozen+ departments. Training is up to you, during orientation they tell you to "ASK QUESTIONS" constantly. But, in practice it is quite different. There are no real training manuals, not that life should come with one, but... I felt like a robot working there. Stay in your ALL white cubicle and don't get the shiny white floors dirty. There are a LOT of 20/30 somethings working there so if you are older you WILL feel your age.