If that was built lightweight like Skilhunt H03(or lighter), I would absolutely love a light like that. Actually I would pay $40 for it even if it had a simple linear driver, not-great-but-ok led and no lightened switch. I would pay a little extra for either buck+LH351D or boost+xhp35 because efficacy is very important for my headlamp uses.
That’s because low weight, great ui, 18700+18350 combo simply doesn’t exist on the market. Modding allows that, but for ~$40 and with extra effort.
I would typically use Folomov 18700 battery-powerbank or Aspire 18350 with it.