My opinions address IT at corporate headquarters (take them as you will)
First and foremost, you have to go into this place knowing there are two classes of people: Long-term employees and everyone else. If you are going in as a contractor in the IT area, be prepared for an indecipherable mish-mosh of conflicting onboarding practices, a confusing array of undocumented systems you are expected to have mastered by day 2 and an incomprehensible attitude of ownership apathy permeating every level of process. If you don't have the patience to stand around starting through a glass wall watching things crumble around you, probably not the place for you as a contractor. However , as an employee, you still have a long way to go to earn the respect of people whose tenure has convinced them of their own supremacy. This place runs more like an abject study in Feudalism. Everyone is warring with each other and crosshairs move randomly. If you want to be embroiled in this nonsense, great place for you. If not, not so much.
Second: Things are done here with no real effort to deliver comprehensiveness or quality. Speed of delivery rules every effort and dates, generally set arbitrarily by a thought process rather than a plan, are what drive deliverables. There are plenty of people running around doing stuff but very little comes out the other end comprehensively. If you have no tolerance for watching vast amounts of mis-management, excuses, questionable formulas and forecasts that defy the very tenants of mathematics, probably not the place for you.
Third: Simply put, many on the leadership team have been there too long and are too far out of touch with the reality of the IT industry. There are some real concerns here. Rooms full of people looking like deers in the headlights with the very mention of aligning product delivery and deliverables with Best Practices. Executives who need mouth pieces to speak for them because they don't like confrontation. A virtual pantheon of regurgitated misdirection, omission, and illustrative narratives that don't pass the smell test yet make it into countless presentations like gospel. If you like your information clear and reliable, maybe not the place for you.
Fourth: It's a land of silos. The status quo is the bedrock on which this company functions. The statement "That's how granddad did it. That's how dad did it. That's how I'm gonna do it." should be imprinted on the walls. Breaking free from how badly status quo is here would be like using a cats nail clippers to free a glacial ice shelf. I heard about the "TTX way of doing things" so often that it became comical to watch the small successes followed by the inevitable landslide of poorly planned failures. Then everyone points fingers, blame is passed around and then a separate effort is concocted to fix the proceeding effort. It's a vicious cycle that just keeps going on and on then everyone wonders where all the resource time went. What it really equates to is that most things are being done in a vacuum trying to fix a problem not fully understood. If you like to feel proud of good work and the execution of solid planning, probably not the place for you.
Final: The effect of pension eligibility is strongly felt in performance. Pension was replaced by 401(k) last year but those that still quality are happy and proud to tell you about how long they have to go. Individuals worry that action will jeopardize their investment in pension and it floats in the air like stale perfume. After a week, it was entertaining to watch people worry they don't have enough to worry about. The more neurotic will tell you they are a mere hairs breath away from being canned despite being there 20+ years. If you want to watch people lose it regularly every time they think they are being watched, this is the pace for you. If that doesn't interest you, probably not so much.
I know this is long review but these are all the things you will easily be confronted with shortly after you arrive at IT at HQ. Many of the people are really great and well intentioned and just trying to do their best to contribute. However, many those that don't have such altruistic ideals occupy positions of power and they like to keep a firm grasp on that power at all costs. As a new manager, it took me about a month to figure all this out. Years later, now in current time, I have said good bye to the battlefield. I had to duck a lot of cannon fodder, run from a ton of arrows and take more than a fair share of stab wounds. Hopefully this will help you make an informed decision.