Not "instant", but fresh made burgers may be the very best in the burger chain bidness. A definite cut above the big three with selections like a black bean veggie burger that I actually LIKE, and the burger with spinach, goat cheese and cucumber. The sweet potato fries give me a satisfying delusion of comparative healthfulness that helps balance out the utter guilty pleasure of those blessed/cursed Haagen Daz shakes. Thought the mushroom-swiss a little disappointing and if you don't care for onion, you may want to skip the Arizona burger as well. The Az burger is food photo worthy - actually looks like a promotional picture, and has a little heat from a chipotle sauce or cheese, but with the big slab of breath-destroying onion removed, is otherwise tasteless, avocado spread notwithstanding.
Consistently clean place with friendly young staff. My service has always been great but I've noted confusion and errors in other's orders on several occasions at 59th & W T'bird though staff apologized and made it right on all occasions.
Even at its worst, it's hard to think of going back to Jack after you've been Smashed.