I bought a Wipperman and am stunned by how long it's lasted.

It shifts as well as anything, but it's lasted, so far, more than twice as long as my Ultegra chains have.

I have the 10sx, which according to their marketing hype is "extremely resistant to wear and corrosion due to stainless steel inner links and nickel-plated outer link plates"

Something sure is working. I keep checking it and it still hasn't worn out.