I was looking at the loot tables will have to see them a bit more before 5.4 hits live but the 4pc is probably needed as it can be a big heal from hitting purify and our stagger levels will be very high in heroic.
If I remember right the 4pc heals for an amount of current stagger so its seems pretty meh for some times like farming if you can get good warforged gear way later on in the tier that has better stats as your BiS