Ok so hopefully I linked all of these properly to tired right now to go over it but I just wanted to show the damage output difference of the trinket on a wide variety of kills.
Is it OP? I think the logs will give you your answer
Also the fact that is scales with gear makes it a tad bit more insane because every upgrade you get essentially increases the worth of this trinkets proc.
Lastly there is loose confirmation that the legendary can double proc it so don't quote me on that. No I do not have the legendary to confirm it.....yet(omg tuesday finally).
Edit: seems like a 25 or 30sec icd
Fortunately only shadow and warlocks prefer it over IoCM so far, so we'll have a relatively easy time obtaining this fantastic trinket.