The most difficult question I was asked was if I had any questions. One of my inerviews was strictly based on my questions, and it was hard to come up with quality questions after the first three or so. Everyone at Southwestern was very receptive of questions, so in reality, I had no questions.
Reviewed my research and future research interests. UT Southwestern has a great website that you can use to look up faculty research interests. It is a good idea to know what some of the faculty are working on that you might be interested in.
What impressed you positively?
Everyone involved with the MST Program is so nice and will go out of their way to help you. The students were really great too. They took us to dinner (and paid for it) and then a bar afterward. The MD portion of the program (the next day) was great also. The senior videos were really funny and it was really relaxed since we did not have any more interviews.
What impressed you negatively?
Nothing really. The program is really great and they really take care of you as an MSTP student.