Not sure if this would be any help but I worked at Sidley's Chicago office for 2 years during undergrad. Obviously I don't have any advice to offer as far as the interview goes. But I really enjoyed my time there and everyone seemed to be very happy to work at Sidley. I was surprised to later read so much negativity towards firms that size. I always felt that I was treated well even as a lowly runner/clerk. Any questions about that office I will definitely try to answer.