I don't know if you ever rode up a long enough hill in the dark to get it to totally deplete the cache battery, and there probably are differences between dynohubs and headlights as well. But I think once the cache battery on a Luxos is depleted, it flickers much worse than other lights. When I used mine on a mountain, the flicker was bad enough it started to make me feel ill. There's probably enough intelligence in most lights built over the last 15 years or so to ameliorate that, but they just don't worry about it. I ride up mountains in the dark fairly often, so that's important to me. OTOH, the Luxos was awesome while descending, that thing on high was amazing.

So I'm going to need some slow people to review these new lights or I'll stick with my IQ-XS