I really want to go to this school, and I think they figured out that I wasn't BS'ing them on that fact. I think if you aren't positive that you want to go to UNSOM, they're going to pick up on that too. Don't waste their time or yours if you don't want to go there.
Overall, it was a good experience, the interviewers seemed to really make an effort to look at me as an individual and specifically how I would fit in to the upcoming class. It wasn't an interview "mill" and if you've gotten this far in the process, you have a pretty good chance of acceptance.