Pros
Decent pay and good benefits. Monthly office lunches and other fun perks. I should also mention, since several of the older reviews have complaints about the premises, that the New York office moved a few years back, and the new office is very nice and quite well lit.
Cons
As others have said, support workers are an afterthought. There's no HR or union, and management does not have your back. Support workers get shockingly little training and no opportunities for advancement. That would have stung a lot less if I hadn't gotten a lot of promises about mentorship and career development in the interview process, which made me imagine a large admin department that people could advance through. But there were never more than a dozen people in the department across all three offices, from interns to the CFO, the whole time I was there, and I never met anyone who was promoted internally unless you count interns being hired permanently.