There was a line out the door at the Strip District and Market Square locations so we drove to the Southside location and walked right in on a Sunday afternoon at 1 when the NFL games were starting. We were able to sit at a table in the back and received table service from there.
It's been about 10 years since I've had Primanti Brothers and it's just as good as I remembered. I ordered the Pitts-burger. Great combination for a sandwich: super soft bread, vinegary cole slaw that provided a little crunch, salt from fresh cut french french fries and a little sweetness from tomatoes to balance everything out.
In and out in about 30 minutes and left very satisfied. I would recommend this location if the downtown locations are busy and you don't want an excessive wait outside. They also have good drink and food specials during football season.