1. DON'T get the cheese-steak ("2nd most popular item on the menu") and DO get the corned beef sandwich. Much much better, not that it's going to be good.
2. DON'T expect anything fancy or amazing. If you've ever been to canters or langers in LA, primanti's corned beef is just a shoddy knock-off version. Less meat, less flavor, soggy/dead fries. And that coleslaw is pathetic.
Oh well, when in Pittsburgh...