I have a human wiz and a drow sorc at level 10. I see a lot of build recommendations to take this feat starting around this level. Is it useful if you cast a lot of lower level spells like magic missile? Is it better if you are a direct damage or a crowd control type? Does it work with the Robe of Duality? My wizard is in a gear restricted group so looking more for loot items, not exotic raid gear. My sorc is force/acid enhanced and a earth savant.