Pros
Extensive and rigorous financial markets and Bloomberg product training in the first few months. Get to do a lot of problem solving and customer service. Michael Bloomberg seems like a great guy.
Cons
Notorious for extreme micromanagement. Structure creates a situation where direct managers are God. Famous for being a "Meritocracy", but what they actually mean is "Monoculture". They promote on the basis of your fit which supposedly includes performance, but more accurately, cultural fit. Cultural fit largely means being liked by your manager. If you are the type of person who can drink the Koolaid, do as your told without question, tow the party line, brown nose etc. You can be Moulded into a Bloombot and fit right in. However if you are an independent thinker, creative, risk-taking, and god forbid; a bit eccentric. You will probably struggle (not to say you can't succeed. It just makes it much much harder).