Scoundrel/Operative Healing Compendium

[Vaylie]

How often do we use diagnostic scan during the course of a raid? Would you say the 4 points in Patient Studies and Prognosis: Critical are crucial to raiding?

I've been thinking of a PvE-viable spec that's also useful in PvP, so something which looks like this. But I do need the 4 points somewhere to spec into Slip Away, and I was thinking of taking them from the diagnostic scan talents.