Picked up a "Bigs" Grilled Chicken & Cheddar sandwich ($6.10). The line was about four people out the door when I arrived just before noon. Things moved along efficiently, though, with the aid of a person handing out menus on the street and another person taking down orders mid-line via an iPad. The time from getting in line until walking out the door with my sandwich was a shade under 15 minutes. It is pretty loud inside, and I could barely hear the woman adding toppings to my sandwich above the buzz of the other diners, the behind-the-counter activity, and the occasional shout of "Chocolate Shake!" down the line.
The Grilled Chicken & Cheddar sandwich tasted decent, and I particularly liked the bread. It was a step-up in quality from Subway and maybe a little bit better than Quiznos, though on the downside you can get more meat from a Subway $5 footlong and Quiznos has more variety in its sandwiches. If you're feeling a bit more spendy ($7 - $10), I would recommend the more creative sandwiches at Cleveland Pickle down the street. And if you're not wedded to getting a toasted sub, I think Jimmy John's would be the way to go.