I was one of the first into the pre-order, so my Lethal arrived earlier today. Holy crap I have never been so happy to have a clone arrive, the minute I pressed the button one time I knew it was for me.
All of my other mechanical boxes have been kicked to the curb, this thing might seem a little flimsy without batteries in it as it's so light but that means it weighs less than my Osmium or Cherry bomber, even though it has 3 batteries. Words do not describe how much this button rules, it has a spring in the button but the spring is entirely isolated from the electrical contact path, so it can never melt! The way the button installs into the mod is also completely awesome, once you unscrew the top 510 plate the button of the switch slides out and leaves the real mechanical workings of the switch exposed. This switch is a phenomenal thing, I've only had it for ~12 hours but I can't say enough about it, I was nervous that the switch may be a bad clone version but NO, it's GREAT.
Here's some pictures and a break down of why the switch is so good IMO, it can operate entirely without the button and it doesn't rely on a spring to keep the contacts apart.
The Mod:
The batteries are very close, but do not touch when installed
To remove the 510 top plate, you take out the two small brass screws to the left of this shot.
There are two solid brass rods which carry the current from the brass base plate to the 510 top plate, pull straight up.
Full shot of the brass rods.
Once the top plate is out, you slide the button plate upwards and out. This portion isn't even necessary to fire the mod, and it takes in NO current.
The back side of the button has a hard plastic nub, not metal. You can see the solid copper reed switch and brass bus bar in this shot which carries current.
The button pushes down the copper reed which makes contact with the positive bus bar, I'm really quite impressed at this switch design personally. No more hot button worries or melted springs!
I'll give an update after a week or so of use, as of right now this is pretty much perfect for me.