We just returned from a trip to Chicago and tried a few "hot spots" for hot dogs in town. Vienna Beef was the absolute best by far. We got a Chicago dog, Polish dog, and Italian Beef, plus an awesome piece of Oreo cheesecake, 2 drinks, and the potato pancakes and fries that came with the sandwiches for $14!!! And they don't skimp on ingredients. The Italian beef, wow... it was a HUGE delicious sandwich packed with juicy roast beef and spicy giardinera. The potato cakes are absolutely perfect, the best taste. The other places (like Superdawg, etc) were OK, but nothing compared to this place, plus we ate twice the food for the $. It's in the cafeteria for the production workers, which didn't bother us (they were quiet and unintrusive). Plus, they sell all their ingredients, so we get to relive it here at home!
Pros: best dogs/sides, incredible low price, clean, fast, A+ staff
Cons: maybe location?, plain setting