As the title says. Leveling my Shadow Priest from 85-90. Basically from 44-85, Mind Spike kicked ass for leveling. At this point though, I'm not sure if Mind Spike still wins out over DoTs. Things don't seem to live long enough to merit dots but Mind Spike spam is rather boring and feels slowish too.
Also, I imagine Discipline/Holy aren't comparable to shadow for solo questing 85+, are they?
At the time of writing, I'm at level 87 and using Mind Spike for non elite/named mobs.