Take a list of questions with you.  There was a great thread on this back when I applied, and I took this and asked them of the DGS when meeting with her, grad students I met there, and some here with people at the schools I was considering.  Depending on where you go, you'll probably be put in contact with a current grad student.  These people are great resources, and most will answer your questions directly about both strengths and weaknesses of programs.   I just looked to see if I still ha