I found this staff to be more useful on magic based mobs, IE Elementals. I noticed the MP drain rate is greatly increased when striking an elemental, or when striking a mob during its spellcasting stage, or while it has spells like Blaze Spikes casted on it.
Got This On AH Today, Its Pretty Good In My Opinion, Only Downfall is the Added Effect barely activates on IT, ~75% on TW 65% on EP 55% on DC 55% on EM 50% on T and 25% on VT in my trials so far >.> Got it for 100k ^^