When the sign on the door says “25 years in business” (and hopefully it isn’t left over from the last guy), well, that’s a pretty good sign.
I’ve been in here before, had an Italian beef ‘hero’ (they called it “Chicago beef”) which was pretty good, as I recall. I didn’t ask them then, or today, if they made the roast in-house or purchased it. It’s not Vienna’s product, which I usually prefer.