I can't trust new NES connectors to be good quality as so many companies make replacements and none have their manufacturing names on them. As I don't trust them I just stay away from them entirely. This isn't the same as replacing capacitors or a voltage regulator, it's more like replacing the stock rear view mirror in a vintage car with a modern generic replacement, some things really need to be kept OEM.

I do clean the OEM connectors with a good cleaning kit and they work like new. Most people don't do this.