I was impressed that the interview was on a Saturday. It really helped because the rest of my Texas interviews had put me behind on school work. After I got accepted after the match, one of my interviewers wrote a note of congrats! That really impressed me.
What impressed you negatively?
Having it on a Saturday made the campus seem a lot less active than the rest of the schools, and I think this might have a negative impact on interviewers. When I went back for MS0 weekend, the campus does have a lot of energy, so don't let the weekend interview, sway you too much!
What did you wish you had known ahead of time?
I wouldn't worry about the stereotype a lot of people place on UT-SW as being really competitive. The majority of the students I met were really down to Earth.