Read this website, thought about some of the most asked questions, studied for a test for the day after
What impressed you positively?
The new building, and the size of the medical center
What impressed you negatively?
Nothing much really, a great school
What did you wish you had known ahead of time?
The weather...colder than expected for Alabama :)
What are your general comments?
Overall a very low stress experience, take it easy, they aren't their to grill you, just put a face to your application and you will be fine. Tell the truth too...it always makes for better conversation.