I'm a 51 wizzie, & I would let it rot. I'm not on Firiona Vie, so I can't sell it; I don't use DoTs of any sort, so the focus is worthless to me; at 2.3 stone, it's far too heavy; there's no resists on it; I couldn't care less about armor class; I can get charisma & agility buffs elsewhere; & the +8 INT bonus isn't enough to offset the other poor stat buffs.
I'd strongly consider it if I were a Necro, or even a Chanter, but as a Wizzie on Sullon Zek, this item is worthless.