Absolutely, stacks or doesn't the damage is worth it. A full support should forget the damn mana shield. A 30/31 with full customs has enough mr due to high int and custom set bonus that those skill points are waaaay better spent in other skills like decay in this case.
((that is, assuming one hasn't been adventurous enough to waste int stats to something else, like str or dex, and as a result is suffering from mana and mana reg deficiency *grin*))
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