Every single test done by Connex shows that the chains made by Connex last the absolute longest... but they're so expensive, only the boutique chains like the KMC Diamond Coat cost more-- so the cost per mile never works out in their favor.
Beyond that test, I've used 3 Connex chains-- two in 10-speed and one in 11-speed. They last the exact same amount of miles as the sub-$20 chains.
The hardcore, obsessed with marginal gains are gonna run pre-broken in UFO chains and never think about the cost. I'm sitting here tracking consumables down to the dime, trying to minimize the annual financial burden of a hobby.
The only thing we know for sure is that the 12-speed dudes are gonna be soaking up the "early adopter tax" for a while.
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