On every visit to Calgary I make at least one visit to Peter's. I can remember eating their burgers and drinking their milkshakes all the way back to Grade 1.
They've barely changed. They moved into a slightly larger location sometime in the late 80s. But that's it. They could have branched out into multiple locations, but they didn't. They've kept themselves in the same location, serving the same burgers, fries and milkshakes for well over 40 years.
Nothing at all has changed about these guys. Same great burgers (they were rated #1 Burger in Canada for quite a few years in a row back in the early 80s ... not sure who was handing out the award at the time or if the award is still given out) with the same great taste, same milkshakes made with real fruit, same giant portions of fries.
These guys have consistently sold Calgarians great burgers for a hell of a long time, without sacrificing any of the quality that made them great.