Buffalo is a good school. I went there two weeks ago to interview. I'm not from NY, but if you're flying into the city, I recommend staying @ the University Inn or whatever its called (they are the first recommended hotel on the list you recieved in your invite letter at the top of the page). The reason for this is that they have a shuttle to take you to the school and back, then to the airport when you leave. (This could save you $ in cab fare)
The interview seemed pretty laid back. It is not done in a group but you will be interviewed by two faculty members at once for 1/2 an hour. You'll prob be done at about 1:30 to 2:00. Consider this question: What does professionalism mean to you?
Good luck!