I'd be curious to know how it does with gravel. I recently tried a different lube from South Africa, Smoove, and it just made an unholy mess.
Apparently you're supposed to thoroughly clean the chain, let it dry completely, then apply Smoove and let it sit overnight.
Already, it's a lot more fuss than I want to deal with, but I tried it and it still turned my drivetrain into a horrible sticky mess. Way more so than normal chain grease mess.
Guess I'll go back to rock n roll lube every ride.