One of two diners open 24 hrs that I have so far discovered in Charlotte. So 3 stars just for being open all night. On Sunday nights when absolutely nothing is open after 10pm, it's your best, if only, bet for a quick hot meal that's not fast food. Not that it's any healthier. But you can sit down to eat and they have a wide selection on their menu.
That said, eating here will very quickly remind you that you are firmly located in the South. Not every restaurant in town has to be metro chic, and ruffians can be found in any city. But be prepared to deal with loud, ignorant people, especially in their mid 20's with no manners and no respect for you, the restaurant or themselves any night of the week. For some people the barn door is always open.