The magnets replace the springs in the bottom switch for the mod. I noticed a big improvement over the springs in my hcigar Nemesis, giving an overall smoother and easier button press, and also will allow the mod to be stood up without having the mod fire. For the few bucks it is, I'd suggest buying the magnets.
from what i've found, the hcigar nemesis springs are much worse than the ft ones. weird right? anyone else notice this? magnets soon