I tried the collards, mac'n'cheese, and the fried chicken sandwich, as well as a sticky bun.
The collards were the best collards I've ever had, bar none. I'm not sure exactly how they were prepared, but it was magic. I also loved the fried chicken sandwich. The chicken was a very thin slice, and the batter was amazing. This was fried to order so it was fresh and delicious.
The mac'n'cheese was okay, but I can make something better myself. The macaroni was a bit soft for my taste, and the sauce was a little bland.
The sticky bun was fantastic. It was soft, chewy, and just perfect.
Best of all, the food is ridiculously cheap. I went with two others and the total cost for our meal was $35, and we got a fairly large amount of food. You could easily eat a meal there for under $10.
The service was friendly, although a little confusing initially, mostly because their system of ordering and paying is a little different from most restaurants. Obviously, this is a one-time problem.
Next time I come to DC I will absolutely be coming here.