Pros
Great benefits. The farther away from the flagpole you are, the more relaxed it is, but also the less your input is listened to.
Cons
I've worked with and in most departments in the company, and IT is by far the most dysfunctional and out of touch. Those in leadership positions are more focused on protecting their jobs and building empires than working together and listening to employees (completing less than half of projects committed to with regulators each year, and being complacent with it, is just one symptom of a major problem). Promotions are based on proximity to Waltham and who you know, not performance. Good employees are often rewarded with higher workloads and more difficult work, while weaker employees are allowed to do less and keep their jobs. Major disconnects and distrust exist between Waltham and other offices, and between IT and the business (IT isn't even allowed to manage their own budget). It's common knowledge within the company that advancing your career requires getting out of IT within 5 years. UK IT leadership is more progressive, open to suggestions and listening to employees, while many US IT leaders give lip service to innovation, trying to stifle communication and collaboration.