Like most of you, I have not seen a self-darkening (aka photochromatic) face sheild. However, personally I have been using an insert that covers the inside of my visor. It won't fog up, AND it darkens and lightens with the sunlight. It's made by Fog City and it's technology is called Hyper Optix. Here's a link to just one place where you can buy them:
http://www.bikebits.us/productdetail_sin...;ProductID=266#Hopefully, that helps out!
Jason
