I had an awful experience with Holly Hill, and so I suggest you stay far away from them.
I went in one evening to provide information for their day program that I planned to start the next day, a program that my pdoc had recommended for me, and instead the staff who were taking my information decided to admit me to their psych hospital-this decision was made by a pdoc over the phone who was listening to the notes taken from the intake person whose title I am not sure of, possibly a social worker or a nurse of some kind. I ended up in their hospital for three days and was finally admitted to the day program, where I received services for two weeks.
My own pdoc has no affiliation with the Holly Hill, so once I was in, she was not my treating physician for that time. My meds were completely screwed up, and I never yet have been able to find a long period of stability.
Good luck to you, if I have to use one of the programs again I plan to go through Duke next time. I understand that both Duke and UNC have positives to offer.

Bluemountains