(Copied from the link above)
What's the price? In my opinion, severe noise levels. This is a deal killer for me. Whenever I wear the XD behind a short fairing or on an unfaired bike, the noise caused by the top vents is pretty much unbearable. And don't forget, we always wear correctly inserted earplugs when we ride (See the wBW Earplugs and Hearing Protection page
). I can't imagine how much louder the noise level would be without earplugs...