Very professional and quick. 2 on campus interviews consisting of a case study and behavior. The interviewers were more junior and were alumni of the school. Case study was actually rather tricky, not like your typical "Case in Point" studies, but something pretty esoteric. Got a phone call from one of them the next day informing me of the final round, which took place the next Saturday.
Superday consisted of 4 interviewers of whom 3 were case and 1 was behavior. Conducted by 2 partners and 2 consultants. Everyone was very friendly, environment was business casual, and firm was very lenient with flights/accommodations/expenses. Cases were once again, pretty nonstandard and esoteric. Received call next business day from a partner.