I've definitely had better, even compared to other airport restaurants. But the options in Concourse D are a bit limited, so if you're hungry before your flight, Twist will work.
The restaurant is located at the far end of the gate. The seating area is nice and open - it's a relaxing place to kill some time. The service was friendly and prompt.
I came for breakfast and ordered the steak & eggs omelette with fruit on the side. It wasn't remarkable, but it was pretty good. The omelette had a nice amount of cheese (I asked specifically for this), and the sirloin was tasty and not too tough. The fresh fruit was a satisfying side to balance out the meal. And I'm usually not a fan of toast, but the sourdough was also quite nice.
Overall, it was a relaxing way to wake up and kill some time before my flight. Don't go out of your way to eat here, but if you're stuck in Concourse D, this is a fine choice.