Pros
Working at Citadel Securities gives you the opportunity to wear lots of hats and have responsibilities from the moment you walk through the door. It's amazing being part of a team and always being held accountable for things that directly contribute to the business as a whole. With that responsibility and accountability, you are expected to put in 100% every day, and it especially makes you work harder knowing you are making a true difference. Everyday, you work alongside the most brilliant minds. The best part is, they're also willing to teach you about a certain system or product, rather than leaving you wondering. You will constantly be challenged from a learning perspective, but also a work ethic perspective, but everyday you gain more knowledge, you get smarter both intellectually, and in terms of efficiency.
Cons
I can honestly say that I can't think of any cons... you work really hard, but it's rewarded. As long as you thrive in an environment like that, then you'll see it as a "pro."