Pros
Chances are, lots of smart people in your entering class, and (on the surface), CEO seems decent enough but whether or not you enjoy the "call-center" division is pretty much up to luck. "Solutions" is the division that produces portfolio risk tools/metrics for Blackrock the "Asset Manager" and also outsources the platform to third party money managers. It is split in to two groups: the Financial Modelling Group who are really the brains behind the risk analytics are a bunch of PhDs. And then there is the Portfolio Analytics Group (PAG) which is basically a glorified call center. If you luck out and join a sub-division within PAG that has a responsible third year associate, you'll learn quite a bit and will probably land a nice job elsewhere after a year or two. Otherwise, be prepared spend your days plugging leaks and to take the shaft when things go wrong. Chances of moving into portfolio management or financial modelling are slim based on past promotions. Most people in PAG end up leaving if they are looking for more than a tech support role.
Cons
6 work days (Sunday through Friday). Certain middle management in Solutions (MD) are careerists and certain third-years are brown nosers with little concern for your development. Expect to get little feedback or guidance. Due to business growth, expect to be spread thin and work hours. Depending on which sub-group you end up in, you might get unlucky and work under a self-serving third-year analyst. (and during evaluations, done twice a year with nary any feedback in between, the third year has the last word on you). You are expected to take on most of the responsibility from the beginning. Because of the complexity of the software (which some have likened to a big rube golberg machine), it's sometimes difficult to exactly pinpoint where a problem started. As a result, most of the "management" that goes on is more of "arse-covering", and if you're not a prolific enough of a blame-deflector, you'll end up with a "strike". So be smart, and watch your own arse first. Be proactive and complain to your hiring manager about third-years if need be before it's too late.