WOW Legion Priest Set Bonuses - Vestments of the Purifier

In this post you will see a short preview of the Priest Set Bonuses in WOW Legion. After the look of the sets, the bonuses from it are the most important information for us. 

What do you think of the set bonuses for your class and spec ?

Vestments of the Purifier Bonuses:

Discipline:

• 2 pieces (Discipline) : Your healing on targets affected by your Power Word: Shield is increased by 20%.
• 4 pieces (Discipline) : During Rapture, Atonement applied by Power Word: Shield lasts 6 additional sec.

Holy:

• 2 pieces (Holy) : Holy Word: Sanctify's Echo of Light heals for 100% more.
• 4 pieces (Holy) : Holy Word: Serenity gains 20% increased critical strike chance if the target is affected by your Echo of Light.

Shadow:

• 2 pieces (Shadow) : Shadow Word: Pain and Vampiric Touch generate 1 Insanity each time they deal damage.
• 4 pieces (Shadow) : For 6 sec after activating Voidform, the cooldown on Void Bolt is reduced by 100%.