very likely it will be a dps DROP if you equip it, even over 496 trinkets. replacing with feathers will certainly drop your dps at least 6k. take it from someone who hastily equipped it on my frost dk 2h, then unequipped it the next day after raid.
it doesnt worth using it on falling protectors or sha of pride both heroic mode ?
You basically need a constant 3 target cleave for it to be decent. The reflections on sha are almost pure padding, and our raid isn't at a point where I can afford to do that yet, so I predominately single target and meat-cleaver stack/leap the ads. By that time, they are dead. Fallen protectors aren't normally positioned right for us for the trinket to be worth anything.
A lot of it depends on your raid group TBH. If things were positioned differently for us, and we didn't run with a ton of locks, I would probably have a different stance.