We hear you loud and clear. I've been running an X-ring chain on my personal bike for the past 2,000 miles or so and agree with the main benefits being:
- Lower maintenance - i.e. less frequent lubrication
- Less chain stretch
I'm not sure about lower noise comment though as it sounds about the same, maybe slightly louder to me with a little more drag noticeable in the drivetrain during coasting (one of the reasons we avoided these type chains initially).
We've also done a test on our standard chain cleaned and lubricated every 200 miles with gear oil and the result is that it also stretches less. The problem is that the lubrication process is a pain in the @ss and the chain flings oil all over the bike (and you). I know it seems like a no-brainer, but there is a significant cost difference here, so we just need to be sure there's a real measure-able difference after 1,000s of miles of usage. We're just concluding these tests now, and it does look positive for the o-ring chain.