Hey, I picked up the Shard of Hate yesterday and to my surprise the proc rate looks to be 100%. So I've made a short vid of me doing Mira Torment 6 to show how often it procs and how crazy it is.
I also have pretty high dps, just short of 600k and I have a chest where I get guaranteed criticals below 24% hp. You'll see my second Seven Sided Strike absolutely trashes Mira.