The interview was very odd, the professors didn't allow me to resent, but instead jumped into their interpretation of my work, interrupting and talking over each other. I was made feel very small because my previous school wasn't a well known institution.

Applied in ~Late November. Got an offer for interview early January. Attended the interview weekend early February (~4 day weekend). The actual interview part was just talking research with several professors. No particularly hard questions asked, mostly just about my own research experience. The hosts were current graduate students. There were also various activities like casual lunches with current faculty, housing tours, etc. Overall an enjoyable experience.