On tribble, I'm using it. I've tried it on Borg and on Hirogen. And it doesn't even show up in the combat log.
According to my tooltip, I should be seeing 1500 shield damage... with the added benefit of decloaking something if it were cloaked nearby. Instead, I saw "0 physical damage" on Borg.... and against Hirogen, it's not even showing up in the log after dozens of attempts at close range (within 2 km).
Is this skill ONLY supposed to target cloaked ships, and we've just not been told this? Is it broken? What's the story? And I've bugged it... just looking for info from other folks, if there's info to be had.