pets?

I have a talent that increases my pet's Stamina and Strength by 60% of mine. I also have a glyph that increases my pet's Str and Stam by another 40% making it get 100% of my Str and Stam.

In the next patch (3.1.0) they are releasing a talent-ability that, when channeled, increases my pets 25% haste for 15 sec and has 30% of its health over that duration. 1 Unholy rune...

I wonder, would this talent be worth using in a rotation instead of using an RP ability, or saving that Unholy rune for a scourge strike (i rarely find myself with one EXTRA unholy rune, they're usually pared with my frost runes)?

currently my ghoul contributes about 10% of my DPS over the span of a fight... giving it 40% more would probably increase that by 2% more DPS, increasing its attack speed by 25% would probably increase the DPS by another 2%.

Is that really worth not attacking for up to 15 seconds?