Pros
The work is interesting. Most of the workers are smart and dedicated and helpful. Despite the crowding (or maybe because of it), people are generally very courteous. There's a gym (employees only) and a cafeteria. Security is taken seriously.
Cons
Politics and BS so thick you can cut them with a knife. RBS is cheap and will do anything to save a buck. Employees are constantly laid off and more contractors are constantly brought in. This can cause conflict among managers. Work/life balance - difficult. Employees cannot access personal e-mail, even on their lunch hour. Offices are packed so full of workers that colds, etc. spread through each department like wildfire, and the parking lot is too small to accommodate everyone, so contractors park offsite and are bussed in. Groups are often forced to have meetings out in the open (with others are working nearby) because there are so few meeting rooms.