As far as drop down visors (internal or external) they've never done a thing for me. I thought it would be a great idea since in the winter months I leave in bright sun in the am and total darkness on the way home. Unfortunately the Scorpion I rode in (with a drop down) bugged me to no end. The visor didn't drop down far enough to be all encompassing and the line between visor and no visor was terribly distracting. My line of vision kept getting drawn to the point where the drop down visor stopped. I have the transitional shield for the Shoei which doesn't get dark enough for canyon rides but works fine for the morning plus evening commutes. The Shoei dark shield however is just fantastic and totally worth the minute or two it's takes to swap before a day run.