I haven't actually ridden here BUT I have heard from some that these trails are used by runners and are not that interesting. From what I have heard, these trails are a bit rough but at 8 miles of singletrack, I don't really see how you could go wrong.
"From I-40/85, take US 421 South. Turn right onto Edinborough Drive (NC-22). Hagan Stone Park is 3.2 miles from intersection. Phone (336) 674-0472.
http://www.singletracks.com/item.php?c=1&i=636