I came here during lunch on a weekday and it was packed! The line went all the way back and around to the sauce station. This was due to only one person taking orders. So be prepared to wait unless you ordered online or called in ahead of time. There's a separate register for that. I saw many people do that and it seemed like a good alternative.
After ordering, the food surprising came out pretty fast. I got the taco bowl which is pretty good. A bit too much red onion on top and a lot of beans. My mom got the 1/4 chicken with cilantro infused rice and sweet potato fries. She said the chicken was really dry and the sweet potato weren't fresh like they had been out for awhile but she did enjoy the rice.
There's not many parking spots in front of Viva Chicken but plenty surrounding the building beside it. I've seen many people park over there and walk to Viva.