Would like the opinion of those who’ve taken the specs into content. I imagine holy is better spot healing and 4piece, but If disc has better mitigation and w/ damage is better for m+ then I’ll have to put up with a more fun healing style ig 
You might watch Automaticjak’s stuff on it, based on my understanding it is A tier but doesn’t bring a ton of utility so you have to have a good comp that covers its weaknesses. Priest in general doesn’t have poison/curse removal which is problematic in the current dungeon pool. It is also far more difficult for the same or worse results than some of the other healers.
No poison removal in a spider xpac does sound really rough. Thanks! I’ll check him out.