I've gone through several banking and consulting interviews, but people at BCG definitely seemed most friendly and yet also most intellectual. Although it is somewhat difficult to land an interview with them, once you receive an invitation for the first round interview, as long as you've been preparing for the case interviews, it should not be EXTREMELY difficult. My first round was back-to-back interviews, about 30 minutes each. Case portion took most of the time each session.

Smooth, well organized, with great resources available for prep. Was partnered with a current consultant to run a mock interview the week before the first round. Scheduling was clear and flexible.