Pros
Outside prestige. Name recognition. Focus on client service. Halli is serious about providing quality oilfield services and using fascinating technologies and equipment. You can make more money than most of your fellow engineering graduates.
Cons
But notice I said "more" money, not "better" money. The only reason you make more money is that a field engineer can expect to work 90 hours per week indefinitely. The best ones burn out within three years. I lasted 2.5. Do not plan to be rewarded--even for making miracles happen. Surrender your dignity. Most engineers at HES hate their job and their boss because the expectations are unreasonable by design. Employees just stay because they are addicted to the paycheck and tell themselves "one more week and I'm gone, just one more week." Multiple divorces are the norm as are addictions to pornography. Halli doesn't care what kind of damaged person they mint because they don't plan on keeping them.