Power Quickness Harbinger is a build that can outshine Condition Quickness Harbinger on encounters that favour a quick power burst or on bosses with lower Armor, like Vale Guardian, Keep Construct and some Strike Missions.
Power Quickness Harbinger is able to provide Quickness and Fury permanently to its subgroup while also offering a decent power damage burst.
Power Quickness Harbinger is able to provide an instant ramp up of every boon to it's subgroup at the start of encounters and phases, including Might. Power Quickness Harbinger also provides ~51%Regeneration uptime and ~60% Swiftness uptime to its subgroup.