Spoke with them initially at a campus career fair, very friendly and spoke at length, displayed interest in my skillset. Had a laid back dinner reception the night before the interview, quite a few reps with 10+ yrs of experience attended, again friendly. Interview consisted of a 30 minute case study first then a 30 minute behavioral interview. It really wasn't difficult, I was literally sick and didn't perform nearly as well as I could have. Hard to say if the case study is difficult since you are kind of walked through it, I think it would have been fun if it wasn't an interview.