Has anyone here successfully mated a trigger assist (aka "E-Z Pull") to a DA revolver to reduce trigger pull?

Just looked up that doohickey and I'll be damned but I cannot for the life of my figure out how adding something between your trigger and your finger is supposed to make for a lighter, better trigger pull...

Someone please explain?

That device adds some mechanical advantage, basically just a cover up for other problems or a weak finger. Might work for a SA revolver, but I doubt it will have enough travel for a DA revolver.

Most trigger assist devices don't play well with DA revolvers, because the trigger needs the full power to reset.

After the trigger is pulled, the trigger has to reset the action and a trigger assist device will usually slow the action down to the point where you can't fire it very fast, or to the point the action may not reset at all.
And as a above, the E-Z Pull device doesn't have enough range to operate a DA revolvers trigger, and if you set it up for SA, the trigger and action couldn't reset at all.

In revolvers, the lighter the springs (or an with an assist device) the slower the gun is to fire.  This is why speed shooters like Jerry Miculek often install STRONGER springs.

Clearly, the E-Z Pull is designed for use on rifles and shotguns, not DA revolvers, or any handgun as far as I can see.

I assume it works on leverage.  Probably designed to apply the most force to the tip of the trigger, therefore increasing the leverage against the trigger resulting in less force needed to complete the action.