Learning. Great opportunity to learn about business, from the inside of a company.
Also, because standards are so high, excellence because part of your professional DNA
Hours. It's a tough environment with limited opportunity to recharge. By the very nature of the work, you always feel outside your comfort zone.
The interviewers were a real mixture of people, I found the senior people were more approachable compared to the juniors - who seemed almost hell bent on tripping you up.