They didn't ask anything that felt unfair, they tailored some questions into my specific area of interest and experience after I mentioned it. Overall they were laid back and didn't feel like they were trying to ask any "got you" questions. The ambassador chat ahead of the interview was a nice way to start talking to "normal" people ahead of having to go into the actual interview.
What impressed you negatively?
The pre-interview email mentioned that the interviewers had access to my application ahead of time but there were no questions relating to it or my specific experiences until after I mentioned them in the interview myself.
What did you wish you had known ahead of time?
That there is a specific few minutes at the end of the interview with the faculty members where they ask "do you have any questions for us".
What are your general comments?
They have general questions they need to ask, but will throw in some they think of in the moment relating to your answers to previous things. The ambassador chat ahead of the actual interview does give a bit of cushion before the actual interview to talk to someone more on your level and get some nerves out - it actually gave me ideas of a few more positive things to say when asked the typical "why kstate" question by the interviewers.