I usually use it mainly for Mp Regen, that is, I don't cast it unless I have room enough for the mana it gives. Apart from that, as soon as I do have room for that mana if it's up, if situation calls for group heal I cast it for that, otherwise in CS for damage. I think it would be rather overpowered if it could be good and beneficial for both damage and healing at the same time and the potencies would have to be dropped. I rather like it now that I can use it as fairly good tool for either.