So I've lived in Union for 10+ years and I will tell you this. If you want some reasonably priced food that is consistently has a good to great flavor, this is it. My family usually orders a full chicken or ribs with rice, vegetables, beans. To me this there signature dish as the grills they use are charcoal and have that char taste if your into it which I am. The fish is good, but a little to breaded for my taste. If your looking for something quick, they're chicken sandwich is awesome but the chicken pieces fall out making it a little troublesome to eat it without the sandwich falling apart. Burnet bbq is honestly a staple cuisine of union and I would recommend it highly.
As some people have said delivery times do vary, I usually just pick up the food because it's quicker. I like eating there but you may end up smelling like bbq yourself!