4 charges too as a lower priority, since you wouldn't want to waste half a charge due to the recharge mechanic.
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No, it's better to use at 4 charges if you're not in meta and you would otherwise be hitting Demon's Bite (and Momentum is up obviously).
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http://us.battle.net/wow/en/forum/to...4316?page=3#47
0.5s ICD instead of 1.5s. Doesn't proc from passive artifact abilities or non-DH stuff (trinkets and the like).
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127% damage buff, 40% fury generation buff, and it now procs Fel Barrage which is also now a really good talent.
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Right, the proc spell is not a class spell, spec spell, or talent spell so it does not get picked up (and the information isn't reflected in the talent spell's tooltip). Same reason Death Sweep and Annihilation don't.