just wanted to give my two cents about this interview. maybe it was just me, but I did NOT find the interview relaxed or laid back. at all. they mention multiple times that the point of the day is to "see how you think on the fly" and i personally felt like they were trying to wear us down all day to see how we perform at the end of the day at the interview. Don't get me wrong, everyone was nice, and maybe this was just me, but they save the interview for the VERY end of the day, and some people had to wait 3 hours with nothing to do for their interview. Also, there's no breakfast, and the lunch was a little questionable. They also watch you pretty much the entire time, so I was a little shy while eating lunch and didn't eat much. there's a bunch of presentations, and a tour where you do have to walk around in many feet of snow (dress warm). The interview itself was 2 on one, closed file but they have your personal statement. I felt like I was prepared for everything they asked me, but what i wasn't prepared for was their tone of voice...they didn't really make eye contact, and had no reaction to anything i said so it was like an awkward one-way conversation with them just writing things down here and there. Also, one of my interviewers would just glare at me with ONE EYEBROW up as if i were the scum of the universe and she couldn't believe I was in her presence.
Like i said, this was just my experience, and it looks like everyone else had a nicer time at their interviews. so maybe they try scaring you on purpose to see how you react under pressure? i've just never had an experience at an interview like this so i found it strange. either way, just wanted to share my story!
Overall advice: bring a snack, drink coffee before hand, and dress warm with plenty of sleep the night before.
hope this helps someone