I bought the Hyper Optik from Amazon a couple weeks ago, arrived in two days. Bought a replacement shield for the Nolan N90 and stuck it on there. Had a chance to try it out on my first ride out for the season on the weekly drive to the office last Wednesday. The transition seems to work pretty well but I'll be more curious about really bright days. When there's a low sun or it's really bright out, I find that the built-in drop down sun shield is not dark enough. So it was my hope the hyper optik would work for what I need most of the time and when it's super bright or riding into a setting sun, I could drop the internal sun shield for even more shade.
I don't know if it's uv triggered or not, or if my shield blocks uv or not, but the thing definitely transitions. Tried it out today just standing in my driveway looking up at the sun and it darkened up. It is there instead of my pinlock and seems to work as an anti-fog just fine, as well.
I did seat mine a hair too low. Still closes fine, but it leaves a bead of light from above it. If I were to stick it on again, I would put the top of the hyperoptik as high up as possible without interfering with the shield closing. Not that big a deal, I can drop the internal sun shield an inch to cover the bead.
Very limited use with it so far so I'll withhold judgement for now, but initial impression is positive.