Is PowerLink length a concern? In using the PowerLinks, I noticed that they are longer, by 0.5-0.75mm, than other links. If you have a gauge for checking the chain wear, you can test it for yourself by testing a piece of the chain with and without a PowerLink.
Principally a longer link produces an increased load on the front of the link and onto preceding links and onto sprocket teeth, accelerating their wear. However, maybe one PowerLink per chain can be lived with. On the other hand, a chain out of PoweLinks should be a disaster. Still, when repairing or adjusting the chain one might end up with a couple or more PowerLinks in a chain. Any opinions, wisdom regarding the issue?