Seemed like a good place to work. Very friendly people. The partners in the second round were a bit more stoic. But case interviews in both first and second round were not exceedingly difficult. I found the written case a bit more challenging as I had to make sense out of 60 slides, write three summary slides and prepare a spiel, all within 60 minutes. I still don't know what the best way to deal with this is. Formulate an initial hypothesis then look for all the evidence you can (risk being way off) or browse all slides, decide what is generally interesting and then synthesize (time is not on your side).