Pros
Best medical and dental coverage possible, extremely intelligent teams of engineers, and interesting international projects. Good work / life balance, most admin are non-exempt and require no overtime.
Cons
Specifically for people working admin, it's a super dead-end job with no hope of any sort of advancement ESPECIALLY if you are a woman. The salaries are really bottom of the barrel compared to the rest of the industry. Witnessed several men in generic admin positions get promoted to different fields from graphic design to cost estimating. Definitely a weird cult ambiance at times, with a keen worship of Ove Arup and his ideologies. A two-tier system is often in place, with admin / support staff not invited or allowed to many team-building events.