I suppose if you make the tread hard enough and dense enough and deep enough, 20k miles should be doable. What we can't tell is if the dry traction is as good as the competition (they don't mention it in their sales pitch one way or the other). The test results they hang their hats on aren't really independent, btw. They were performed by someone other than Michelin, but they were performed under contract to Michelin. That to me is not true independent testing.
Anyhow, if they are as good as the claims say they are, they sound like something worth trying. Especially if they will last that long and resist the cupping that seems to still plague the Dunlop's to some degree. Go ahead and buy them, then do a coast to coast to coast to coast run so you can give us an unbiased and truly independent report.

Too bad they chose to make the sidewalls so ugly. That is liable to keep some hard core Harley folks from trying them, since style is more important than function don't cha know.
Jerry