Shard of Contempt...Follow

A rogue in my raid has this beauty.
Don't get it with your hunter however, you don't need expertise rating and thus ~80% of the item's budget is wasted on stats useless to us hunters.
This trinket is really cool for rogues, warriors and perhaps feral druids. For those it is one of the best trinkets in game.
If you want a cool trinket with an AP proc, go for this one.
The Hourglass is better. Crit > Expertise rating for hunters. And the AP buff is also rather strong.
Apart from this I expect the Shard to be nerfed (I expect the duration of the AP proc will be nerfed at least). Expertise alone is godly, but the additional AP make it a really really strong trinket for melee classes which beates nearly every other trinket, even those from black temple.

The uptime is quite good (~40%), but it's still not worth getting as a Hunter. It's essentially a ~90 AP passive trinket without a clicky effect - you're much better off with, say, a Bloodlust Brooch or Hourglass than you would be with the Shard.

It's obscene for melee DPS (and non-Protadin tanks), though. I finally got mine after six runs.

Don't let any melee hear you saying that. It's one of the two best trinket until halfway through Sunwell Plateau.