Think ppl said that if u play SV (which u kinda need now on few fights) u should switch instant.
Think ill break my 4set when I get 2 pieces 522(even offset), gonna try on dummy when I do.
I broke my 4 piece straight away for a new 2 piece, but I have a special reason. Had heroic tier in all slots besides helmet and gloves. My gloves were LFR and I had a different heroic helmet. Just upgrading my gloves to a T15 normal mode piece was a big upgrade by itself.
As for the set bonus, it's amazing for both Beast Mastery and Survival. But it seems to make a much bigger impact for Beast Mastery.