Pros
Bloomberg has amazing benefits and a lot of top notch l people work there. The company is very efficient for the most part with robust investment in technology and incredibly smart developers. Once really gets the impression things get done here. In certain departments, you really feel like you're making a difference and things are actually meritocratic. Journalists among the best in the world. The company pays better than industry standard and treats its employees well. Mike Bloomberg is amazing both as an entrepreneur and for what he has done with philanthropy. Even after leaving I still hold tremendous respect for the firm as a whole.
Cons
The reality is it's actually very hard to move internally at Bloomberg despite what they try to say as roles are highly specialized and this is a serious downfall for those not in the know. If you're a journalist or developer, that's not the case. But for those in product management or specific verticals, moving within the company can be punishing. Sometimes even the most qualified candidates don't get chosen for a role based on a manager's whim. It's also very hard to move back to a role once you've left one so employees can get stuck, even when they are highly skilled and knowledgeable. You basically have to wait for someone to transfer or get fired and then hope a manager in power will take you back. One could wait years for a role to open, so it usually ends up with the employee voluntarily leaving. Thus making a career here is not for everyone. Certain departments function extremely well like core product whereas media and enterprise are faced with constant reorgs and management challenges. Work/balance non existent in certain departments. The company tries to act like it embraces promotion of women and minorities but in practice it's far from reality. They have tried to move positively in the direction of greater flexibility but it really varies depending on the department/role/manager. It's not uncommon for some employees to be expected to work 12 hours a day with the average being 10, making it not very family friendly. Especially at headquarters.