On the Necromancer epic

[Safon]

How much of an improvement does the Necro epic bring to the Necro? I am too casual to do it (seems like some classes get boned with their epic difficulty), will this put me at much of a disadvantage compared with Necros who do have it?

I see it has a snare component, does this mean that the spell the epic casts will not stick on rooted mobs?

Thoughts?