I tried the brand-new Frontera Fresco at the State Street Marshall Field's 7th floor food court for lunch today. For $12.90, I had one shrimp quesadilla (comes with a small side salad), a chicken tamale and a limeade. So, yes, it's pricey for a non-airport food court.
I just expected the quality to be better. The quesadilla was woefully short on queso, so much so that there were bare spots of nothing but tortilla. The quantity/quality of shrimp was OK, but they just tasted like small defrosted boiled shrimp. De Cero's shrimp tacos and Chilpancingo's shrimp/chipotle quesadillas are vastly superior (as is the one served at the real Frontera Grill). The side salad was delicious--fresh/tasty mixed greens, not overly dressed and sprinkled with aged cheese. The chicken tamale was not good. The masa was nice and light but the first 2/3 of the tamale had no filling at all. There was just a little blob of filling in one small section.
Salsas were good, as one would expect. My raspberry/cactus apple liemade was good, but too sweet. Before a final judgement, I want to try some of their tortas and other items, but my first visit just merits an "eh." Certainly better than Taco Fresco, but shouldn't expect more?