You're giving them too much credit I think. I'd say there's a 50% chance any given Dorman product will even fit, and then if it does I'd give it a 20% chance of it lasting more than a year. I'd take my chances on untested junkyard parts rather than new Dorman junk. Unless they just take "failed" OEM NSSes, clean them out, and sell them as new. And even then I'm sure Dorman would find a way to screw it up.
I've never understood why there would ever be a need to replace an AW4 NSS under any normal circumstances. They look intimidating enough but it's just a set of contacts on a wiper. Just clean it out every so often and you're golden. I've never, ever seen one failed, just full of crud. For $5 a pop I completely understand why people would buy them just to have, but I've never seen where someone's actually needed to replace one.
They're made in Taiwan.
The reason many folks replace them is that they break them taking them off.