A face shield comes in handy on those 200-mile dualsport days
I've worn my Arai XD on pure singletrack dirt rides, but I don't like to do it. My first dirt ride with it I face-planted and kinda messed up the ungodly expensive faceshield, even though it was in the "up" position at the time. Luckily I don't fall off so much when dualsporting.
On the other hand, I've been wearing the XD every day on my commute now (ever since someone stole my Arai Quantum II Haga Replica last month

) and I love having the visor! It makes a huge difference when riding into the sun. I don't notice it when on the freeway unless I'm doing +80 or so.
I need to get a real street helmet pretty soon, though, as it's getting kinda cold in the early mornings and the XD lets in way too much air.
WoodsChick