I liked it a lot! It was a pretty organized day - they give you an intro of the campus/information about the school. Then, you are divided into different groups and you either go on a tour or do your interview. I actually really enjoyed the interview - you almost can't prepare for it. There are a few videos on youtube about how to prepare for an MMI, and I think it was helpful to think about important points to hit. I think you can't really prepare for the interview questions, but you can know your story and your background. My best advice is to answer the prompt and don't waver in it - make a decision and don't be afraid of what your decision is. Relate your answer to your experiences and be confident in them! I actually really enjoyed my experience interviewing.
I thought the campus was really nice, they seem to be really invested in their students doing well. The faculty was really nice, as well!