Pros
Everything you could want in a corporate job: nice space to work, beautiful views of the city, competitive pay with benefits, and the work is interesting, if you know what you're doing. The cafeteria food is delicious, and affordable. I've heard rumors that it's operated at a loss because the company ran the numbers and calculated that it's more cost-effective to do so in order to keep the employees healthy so they can pay for less sick leave.
Cons
It can be hard to get answers to questions about how processes actually work and what is expected of you. Sick leave and vacation time come from the same pot, so you will get fewer days off if you get sick a lot.