This is the 'Shadowstrike' of Naxxramas.

got it tonight, situtional trinket at best, anyone but a lock or mage w/ this would make me laugh at their misue of trinket slots.

Actually no this is not that bad for paladin if they are illumination spec. I got both mage and paladin myself, I would much rather take this for my pally than mage -_-. There are so much better alternatives for mage, this one is just another eye of the beast for a mage. GZ If you are so far in Naxxramas and still lack Neltharion's Tear!

Thottbot says 2 minutes cooldown.

As a paladin I would use this trinket if illumination is your thing.

Hehe...

I'm warlock (horde one, so no -30 passive) and I have Fetish of the Sand Reaver but even with my damage current damage and Fetish, I can't go all out--> so more damage trinks are useless and in Naxx my overall damage will increase anyway with T3, so this is my trinket number two. I think mages will go towards Restrained Essence of Sapphiron and Nethalion's Tear combination?

I would say it's pure horde warlock trinket :)

Certainly DPS casters are going to want this, but I'm not sure how badly.

Those that are going to have access to it from Naxx will likely already have a shot at Fetish of the Sand Reaver which provides far more aggro reduction. The addition of the +2 crit makes it nice for dps, but the aggro reduction is probably not enough to run in and mass AOE bomb a mob (they will likely still come and eat you).

If you notice the T3 priest set has a very nice 4 item bonus:
"4 pieces: On Greater Heal critical hits, your target will gain Armor of Faith, absorbing up to 500 damage."

If you look at the full set, there's not one item that has +to crit. It's all stats, plus healing, and mana5.

Now go find me a ring, necklace, or cape that's healing focused that has +to crit.

Or better yet, don't bother, you won't find one.

There's the priest staff (hopefully you've upgraded this by Naxx, or will soon after), there's a mediocre 1h hammer in ZG (which again hopefully you've upgraded).

Now you can pick up some dps caster items like the Twin Emps off hand, or some rings that have damage/heal that have crit, but you won't find any high quality +healing only items anywhere with +to crit.

Why would a healer want the aggro redux? Well it probably depends on your style and how hard you heal, if you heal on a pull, etc. I'm a priest with over 800-900 +heal depending on my gear, and by the time I'm done with Naxx it'll easily top +1000 healing. I expect my aggro situation won't vastly improve. Single bosses aren't a problem, but when there are bosses or mobs that add, or dump aggro, they tend to find me very tasty. This is because I spam large direct heals, and AOE prayer heals. Other healing methods like renew, are less aggro intensive, but high impact healing, especially when there's a lot of adds can get a lot of things very angry at you.

By the time you've upgraded to T3, you'll find the fixed aggro reduction of Fade simply inadequate. It reduces aggro by a exact amount that does not scale with gear, while you're healing for far more per spell, and generating a great deal more healing aggro.

I'd want this both to get procs from inspiration, and the T3 four piece bonus. And I'd use the aggro reduction aspect of it frequently.

I can see warlocks going nuts over this.

drop from thaddius... got dised ;)