A local Pittsburgh chain that lasted for a hot minute was Winky's. Supposedly there was one in Wilmerding.
I was known to enjoy the Chi Chi's lunch buffet, especially the churros with strawberry sauce.
I saw a Pizza Hut lunch buffet last week in Cranberry, PA. Unfortunately, it was at 5:30.
I concur that Roy Rogers made a good roast beef sandwich.
Hometown buffet was also good for stretching my federal per diem budget.
Most Pittsburghers of a certain age miss Isaly's, especially their skyscraper cones. Toasted almond fudge was my favorite. (My mother would buy it by the tub.) They still live on via Klondikes and chipped chopped ham bbq sauce.