I know that Mastery is the best stat for the spec. I also mostly do LFR because I've never been keen on strict raid times (I play when I want to). With that in mind, here is my question:
If a slot in LFR has no gear with Mastery on it, should I go for something that has Haste in that slot's gear instead?
Possibly-inaccurate example: LFR BrF has no Mail boots with Mastery on them, but one boots piece does have Haste. I would go for those boots, yes?