I have had GM timing chains (Buick 3800 series 1) go for 180K without any noise etc. I have had Buick 3100s be running fine but feel like a brand new engine when a timing chain was replaced, and i hav had a ford explorer SOHC timing chain go bad on me TWICE in 100,000 miles.

With this being honda's first go at it measured against Honda's known reliability...anyones guess... I wouldnt want the first year of it as they seem to improve things along the way AKA v6 auto trannys were not up to honda's typical snuff...

However that said i dont think that timing chain engines are EVER set up as interferring engines meaning if the engine's chain breaks you will be fine unlike belt engines. Carbon deposits can lower the clearences and make an non interferrer and interferrer but that has been my experience.

Regards
B