My lock alt is a fire destro build, 0/21/40. Really impressed with the dps, but I find I never use my lovely 21 point Demo talent, Demonic Sacrifice - mainly because the group/raid wants my imp.
In 25mans, of which I have little experience on this toon yet, I foresee myself being parked in the MT group and being the Blood Pact bitch. So I now ask myself, what is the point of those extra points in the Demonology tree? I'm toying with the idea of this weird-looking 7/14/40 build:
Talent Calculator - World of Warcraft
In it I have given up some mid-table Demo talents I won't use for Instant Corruption (some use in mobile fights) and 2/2 Improved Life Tap. I reckon I cast Life Tap every 5 or 6 casts in long boss fights, and not having to do one in six of those means an extra Incinerate every 30-40 casts. That seems like a decent dps boost for 2 points.
This is starting to look like a "what do you think of my build?" post. I guess it is, but it's more about the broader question "is Demonic Sacrifice a core destro talent?". Well?