I went to visit earlier this week, and was very impressed. The school's building is nothing spectacular, but is certainly functional. Apparently the student lounge/locker area will be renovated next year, which is good to know. The library is the nicest part of the building, and seemed to have plenty of quiet places to study. The class I sat in on was very quiet, but then again it was civil procedure, so probably not the most exciting of subjects for students.
More than the building, what I really personally loved was the city of Pittsburgh itself. Coming from a much larger city, it was refreshing to walk around quiet neighborhoods that could pass for small towns, but really are in the middle of a good sized city. I did not meet a single person who said a single bad thing about Pittsburgh or Pitt, which may sound obvious but seriously does say a lot about the city and university.
Also very impressive, to me personally anyway, is the Semester in DC program, which allows students to spend a semester living and working in Washington. As someone who wants to work in government, this seems like an open door, and a program in which the law school is seriously investing resources.
I'm still deciding between Pitt and one other school, but this week's visit did a lot in terms of helping that decision along. I strongly suggest that other prospective students visit as well; it's hard to get a good sense of Pittsburgh without actually going there.