A neighbor of mine just had to have one, in stainless, back in the 80's. His, with .22 ammo that wasn't the equivalent of today's Bilk Packs, ran about as well as any of the other small .22 pistols of the day. Nothing to write home about, but not quite the horror stories one hears about. When I went back to my old home, I talked to him, and he mentioned that he still had it. It only gets the occasional range outing any more, but he still shoots it.
I own a Model 400S Sterling, in .380 ACP. Large for a single-stack .380, but it's been reliable over the years. It recently, during an extended range session, decided to snap it's rear sight blade in two, with the parts departing at a really surprising velocity. A local gunsmith located a replacement sight blade, and installed it. The gun is pretty typical of early 80's production, being finicky about JHP, but quite reliable with ball ammo. Parts, though, can be an issue, as Sterling closed it's doors decades ago.