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Photochromatic shields are great, but if you're using a dark tinted shield currently, it won't go nearly that dark. Think of the lightly tinted shields that many brands offer (but no one actually buys). They're gotten really fast and responsive though. With the original ones you'd ride into a tunnel and you'd might as well have your eyes closed. ICON makes one now too.
Drop down visors are nice too, but you'll end up with a helmet that is noticeably bigger and heavier as a result.