I have two mods from Smoktech that I use frequently: the Prospect e-pipe, and the Sidewinder 18650. Both have magnetic switches that work very well, and both have the same reverse thread lock system. It's pretty fool proof. I can put either in my pocket and have never had it fire accidentally when I have the lock out set. I was really unsure at first, but I've become a big fan of the magnetic switches.
The magnetic switch really interests me to I was looking at the magneto as a choice, but I watched pbsuardo review and he showed how it the switch came undo it just auto fires, I was having second thoughts. Thanks for for the input.