They don't work in the planes anymore, only normal zones.
They aren't that good unless your grouped with buffers or you're a druid with regen or a cleric with high hp (takes 1200 hp to regain the mana casted from CH, all xtra hp after that is pure gold) but they are unique and one of a kind
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It's also a great PL tool for casters if you can heal them. Wizards would be a good example.