Let's assume, just for the sake of safety, that despite appearances the old gang is a brittle, untrustworthy thing. Let's further assume that if the boat is sailed good and hard, in warm waters, that the new wire will have a maximum safe lifespan of 10 years. And finally we'll assume that the swaging machine is in perfect spec, that it is a rotary machine, and that the operator dips the wire ends in Boatlife or some such goo before swaging. Given those assumptions, you could have a gang every bit as reliable as one with Sta-loks. If the previous owners of your vessel had installed Sta-loks, we wouldn't even be having this conversation.
Swages are a wonderfully cost-effective terminal, for the person doing the swaging.
We put them on boats in northern waters, or when there's no other choice in southern waters, as when there are odd terminals, available only in swages, or the owners insist. If you go with Sta-loks or Norsepeople, the quality of the terminal is up to you, so be sure to practice a bit. You might also want to see our video on the subject. Thanks for the response. I'm still not clear on why you chose the Sta-Loks over swages.