just got this yesterday,, man the thing is small, i have not used it yet other than just "playing" with it last night. I might gaet some outdoor shots tonight or tomorrow. I am happy so far.
its all metal, the manual says do not let it run for more than 5 min standing still. and that it may get warm. As its a "bike light" its ment to be used while "riding" a bike so there will always be air flow to aid in cooling.
I'm not convinced that a lamp that can't be used in still air is a good idea. You could spend a prolonged period in still air if cycling with a decent tail wind
The body is solid aluminum and feels quite heavy for its size (not that overall it's heavy--it's just that tiny), suggesting to me that the material for heat sinking is there, though not externally apparent with fins that some other bike lights have. I guess one of us with the light will have to take it apart to see what the design inside is like, but I probably won't be doing that any time soon unless the light fails on me.
It's also got six modes, battery capacity indication, visual indication before the light cuts off due to low battery, the usual for "smart" bike lights.
The best thing about it as a bike light is that the beam is wide, smooth and doesn't waste much light up in the trees or sky when riding on the road, everything my Fenix L2D isn't, nice as it is as a flashlight. The Lowes Task Force LED light has a smooth beam and doesn't waste light either, but it's a bit narrow. I suppose two or three of them would be a match for the MityCross beam-wise, but without the modes, without the Li-ion battery, with a relatively gigantic size, and a significant lottery component in getting a "good" one, nevermind getting matched colors among multiple lights.