To eager to promote your own material to actually try to understand whats being said?
It’s not changing immunity to resistant, just seeing when immunity is broken by it showing as resistant.
It works best when combining it with other lower resistance effects like facets, but this doesn’t work with a trapper because the traps are “minions” and the effect of -5 res after immunity breaking does not function.
When I finally got one on my Nova Sorc I definitely noticed, although I did also notice my mana draining fast , as a Manashield build I did have lots of mana so was pretty acceptable, though a bit more dangerous at first when I kept forgetting my blue health orb depleted a lot faster.