Why do so few people mention this when they talk about their healing rotations? Its one of our most powerfull spells even without the 25% crit boost to all spells for 6 seconds. For example if you pop this on the tank, then cast a heal on him with boosted crit chance, you will now have a renew running on the tank with full duration and an extra 25% crit on each tick.
It seems people forget they got this spell.