Did Someone say "tougher than nails"?
https://www.youtube.com/watch?v=C6bYZZUS3WA
Here's the video where they drop an Elzetta out of a helicopter. Twice.
Result: inch-long chip in the concrete.
https://www.youtube.com/watch?v=KIa96YjsRbY
It did pretty good with a point-blank shotgun blast of birdshot... but buckshot pierced the body.
https://www.youtube.com/watch?v=1ozstdsnHNs
Taking it apart and putting it back together, while underwater, is also quite impressive. I think this also proves it's worthiness against dust and grime impregnation.
https://www.youtube.com/watch?v=aaCwgVrdXFA
One of mine was dropped in a bucket of latex paint, I just hosed it off and stuck it back in my pocket.
Elzetta's decision to use a solid acrylic lens instead of a reflector and glass adds another dimension of impact resistance.
The rubber covering the switch might be the weak spot, i can imagine some situations that may cut it. But i can't think of any normal situation that might seriously damage any other portion of the light.
They do not overdrive their electronics.
If you need the 18650, buy a bored Elzetta from OverReady. Runtime is longer with the 18650.
Get an Elzetta, you will not be sorry.
The only thing you'll worry about is who do you leave it to in your will. Heirloom Quality.