Pros
It's a stable firm organized in relatively small, independent practice groups. Clients are usually large institutions so the work often involves serving an in-house lawyer. Generally, lawyers are smart and slightly nerdy but polite. Your experience will depend on the partner(s) to whom you report (and how many). It's a pleasant place overall. Looks great on the resume when you leave.
Cons
The firm seems to approach the practice of law from a very conservative position. Politics among partners is a factor but behind the scenes. Sometimes it seems as if a bunch of sole practitioners are sharing space and resources. Bonuses seem modest compared to other firms of this size. It's not great at diversity (although there are openly gay male partners).