Pretty well structured, got an invite for a first round later in the week. Two interviews, back to back, with about 10 minutes of behavioral/background questions, 30 minutes for the case question, and then 5 minutes for questions about the firm. Overall relaxed, though it was tough to get a good read on the interviewer. Definitely brush up on basic math, especially multiplication and division and practice in front of someone as it simulates the pressure you'll have. It seems like even a simple math error can doom you, so practice. It was well run, everything was on time. Though they said that candidates could get feedback post-interview, though it hasn't been forthcoming which is somewhat disappointing. Overall a decent experience but hard to tell why one makes the cut or doesn't.