The technology seems to work.

Used to have a pair of Oakleys that I used cycling, found that they were just too dark to see well in the trees.

These Julbo's do seem to adjust when you enter the shade from the bright light.

Haven't used them for skiing yet, but they're just not as dark as the Oakleys were, so the bright light off the snow could be an issue.

The shade change is very fast, and is working well on snow to shade and back, very easy on my old eyes. Light transmittal seems about perfect. Optical clarity is excellent, with no distortion.
These glasses are very resistant to fogging, and under some pretty extreme temperature changes; best I have experienced.
They are also light and comfortable to wear.
I like the larger size of these glasses, the side protection is very good and blocks excess light even on open snow(these are ANSI approved for all you working folk).

I was looking for ski glasses that would give me good late-day/flat-light contrast -- these really work well for flat light situations (and they darken for bright conditions). Nearly complete wraparound for medium sized face means good wind protection. No problem with fogging either.

These are great glasses. Great when going from sun to shady areas. Wish they performed a little better in bright sun.

I live 2 hours from any Julbo dealer but have owned their products and know of the quality so when I broke my first pair I automatically went back. I ordered these and loved the lenses but the frames were bigger than I liked and so I exchanged them for a different model (the typhoon). I will always use julbo, nothing compares, these just weren't my size.

At first these things sounded like a gimmick, but I am really impressed at how well they perform. The anti-fog coating keeps them from getting all steamed up on bike rides (like the Reflex glasses do). The stems are more comfortable than the Reflex sunglasses as well. The color-changing lenses do such a good job that I often forget they’re on and get strange looks when I wear them inside. They don’t get quite dark enough to be used on high-altitude climbs, but my eyes seems to be more sensitive than most.