While I did have a tenderloin last week, I have yet to dine out at a SteakN'Shake this year. I have almost forgotten how wonderful and greasy my beloved chili-mac's are.
There are tenderloins all around Chicagoland. Down state, they are probably more prevelent than up here.
I remember that the frozen section was the only place to find them in L.A. a decade ago. I remember missing them while I was out there. They did have this place I liked to go and order teriyaki burgers (topped with pineapple slices). Those were good.