Anyone using them? (see http://www.quietridemuffs.com/ ). I've spent so much time and money working on quietening the screen air noise on various bikes (AN650 Exec is actually pretty good already). I've got custom ear plugs and they're OK for a while but are inconvenient and hurt after a while. A helmet with built in ear-muffs seems like an excellent alternative - could get away with lower screen - just enough to get the wind off the neck. If anyone has any experience using these - would love to hear from you.