Yeah Talia's rework does seem to make her a much better character than previously, and I'm sure her heals and cleanses are great.
The problem I see with her is that she kind of runs counter to the most powerful gimmick the night sisters have right now: Revive.
Under a Mother talzin lead dead nightsisters assist the living nightsisters. In order for that to happen, you have to have dead nightsisters. Asaj and Old Daka are getting bonuses for people dying. Zombie and Acolyte create an impenetrable wall of defense together (more or less).
So there's plenty of sources of revival in this comp. Healing is kind of unnecessary... almost gets in the way even. Just remember that buff wipers are your mortal enemies with this comp. If you can take out Baze, Asaji, B2, DT right away, you'll be set.