On-campus interview with recruiter, alumnus of my university. Asked me to send back a brief "thank you" explaining why I still wanted to work for them after the interview - basically another cover letter. Got a phone call over a month later asking me to schedule a power day, consisted of about 6 1:1 interviews with people in various parts of the company and a really easy math quiz and IQ test. Received an offer within two days. No quant, no cases; pretty much all fit/resume review type stuff.