So I've been trying to upgrade as much as possible(down to 1 blue, but epics are all mediocre upgrades that I can access) and I am having trouble letting go of my trinket.
I'm Frost "main spec"(solo and crappy heroic group setup) and Arcane "offspec"(raiding and talented group setup).
Now the card, here is pretty fabulous. 85 Crit and occasional 1750-2250 shadow damage(which, btw, can crit).
The proc rate is pretty darn high. Now as Arcane the benefit is a little lower except my Crit is pretty high. It's nice seeing the occasional 4k extra off a single Missile from AM or a random even 2k tacked on to AB.
The bigger joy, is as Frost dropping a Blizz is ridiculous. Every few seconds I'll see 1k-4k pop up in addition to Blizz damage.
As Arcane in a single VH, I did 69k dmg JUST from Card(used Flamestrike->Blizz on squads, usual AB,AB,AB->ABar on keepers/bosses).
This makes me wonder if there are any trinkets really worth swapping it for. Right now I sit at around 1800SP unbuffed(sig is based on Frost) and with raid buffs and a trinket proc I can break 3.1k but my Haste/Hit suck. Don't have numbers offhand since, again, Arcane and Frost are very different, but I can tell you hit is <200 and Haste is <300. Problem is Hit is not an issue. I rarely, if ever, miss as is. I find it hard to justify less crit or SP to get more Hit, and Haste is nice but rarely comes without taking a HUGE crit drop.(T7.5 pants give haste but I lose 89 crit.. other stats are same.)
So I have to wonder, am I okay just keeping Death?