Met them at our school's career fair (they're our biggest recruiter and our school is THEIR biggest recruiter) and they were really friendly and nice. Dropped off a resume with them and got invited back to interview a few weeks later. Only a 20ish min interview that was pretty straightforward and easy. Found out a week later that I was invited back to a final round interview in McLean, VA. Final rounds consisted of 2 case and 1 behavioral, each 45 mins long. The cases were of medium-hard difficulty, but I stumbled because the interview was unfriendly and this was my first formal case interview ever. Found out a week or so later that I didn't get it because they wanted to see stronger performance for my cases. Overall the people were nice and really friendly. Most of them were pretty young (under 35) and talkative/helpful.