I've been to open gym at Carolina Courts a few times, and it is okay overall. The $4 price tag to play each day for non-members is a bit steep, but when you really want to play basketball and it's wet/cold outside it can be worth it. There's usually decent competition at the gym if you go at busier hours, but you can also have a court to yourself usually. The courts themselves are in pretty good shape, and the staff has been fairly friendly in my experience.