"they're designed to correct problems with GOOD chains, not worn chains. "

Gsxr, Can you elaborate on that ? Perhaps some reference ? How does the logic run on that ?

My father ran the original chain for 25,000 miles on his 750 Honda which did not have an automatic chain oiler or an enclosed chain. Perhaps you are underestimating what a big double roller chain is capable of doing .... ( The Honda chain was only a single ).