CS adds 10% to your base dps. Think about that. Perm 10%. It has a VERY fast animation, so you can use it in that .5 second window after healing better than almost any ability and lastly it has one of the kindest recasts in the game. 5 seconds isn't even a punishment really. Cast swift while you're waiting for it to finish ticking or (lol) stoneskin if you're that screwed. Cleric stance is probably the best skill in this entire game. 400+% dps boost. Why thank you!