I've had a Transitions visor on a Lazer helmet. They're simple and work well. I've since gone to a Neotec and the best you can get, to my knowledge, is tinted and mirrored visors. To get a genuine Shoei tinted visor I believe you have to get one from Europe.
Sounds great but $$$$ I bet.
I put a couple strips of black tape, even w/ my eyebrows, side to side, to top of shield for riding into the sun. Just tip my head a bit. Works for me.
Although a shield that darkened might work as well.