Also, one thing I'd really like to make clear, is that there isn't a "midway point" where haste hurts you rather than helps. Yes, haste can change your rotation, but seeing as our rotation is merely one of keeping things up and on cooldown, it doesn't negatively affect us. Here's an example that might help clarify that point: Elemental shammies are conflicted about haste because their ideal rotation is 3 lightning bolts followed by a chain lightning, repeated indefinitely. This works perfectly because the 2 second lightning bolt cast, times three, fits perfectly into the 6 second chain lightning cooldown. When they start getting haste, they just have a buffer of wasted time between the third lightning bolt cast and the end of chain lightning's cooldown. Thus, haste is only good for them once they can do a 4:1 rotation without losing too much dps from delaying the chain lightning. Shadowpriests don't work this way. We don't just cast, say, MB, 2xMF, MB, 2xMF, etc. We don't have a rotation, per se, but rather a priority list.