Everyone needs to get this! it's basically an instant evac spell for every class, since it CAN be cast while aggro'd. Half-second cast time is essentially instant. I've never seen it interrupted in combat. And it never fails, like both gate and evac spells are prone to do, and often at the worst possible time.
The only downside is the 30-min recast. But if you have to evac more than once every half hour maybe you need to reconsider your hunting strategies!