Blood DK trinket reward.. how good is this?

I have an option to take my chest tier set piece or this trinket posted below… this trinket looks insane… anyone know how good it would be? I only really do mythic+, barely any raiding…

add https to ://i.imgur.com/bwYmxOz.png

edit: nevermind… i missed the part where it says UP TO 853,111. I thought it was 30% up to 8.5mil, rip lol

It’s actually kinda nice. 1 minute cooldown, the 30% reduction for 853k means you have 30% dr for about 2.5M hp so essentially the same amount as a Tombstone. But the big thing here is the Attack speed reduction. In large Auto Attack packs that’s 15% dr for 15 seconds. Also it can apply to raid bosses. 15% slower attack speed combined with Insidious Chill on a raid boss? Thats 35% slower attack speed with a 25% uptime.

If your co-tank has this too and you coordinate you could keep a bosses attack speed significantly lower for 50% of the duration of a fight. Imagine Patchwerk or Igira fights where most of the tank damage is a stack they put out every AA. Just a huge reduction on both tanks damage intake.

Sure it’s not great for damage output but when it comes to living and ramping it’s a nice little button to have.