If I am doing a mix of activities, Soulbeast is awesome. Great mobility and burst. Roaming, doing dailies, or supporting a zerg, it works great. Survive-ability depends on timing and dodging--being in the right place at the right time. If I am going to join a zerg for the evening, I switch to a meta build (backline hammer) because I can down more invaders. But that Herald build is pretty useless outside a zerg, unlike the ranger.