The Headband of Intellect has a pretty major nerf. One of the primary reasons for high intelligence is to have more spells as a wizard (especially when you can dump one or two levels into wizard and learn from scrolls). The number of spells is calculated from the character's actual intelligence, before the headband adjustment is added. I tried using it on Shadowheart to dip into Wizard spells, and her low Intelligence made this not worthwhile.

"He that can smile at death, as we know him. Who can flourish in the midst of diseases that kill off whole peoples. Oh! If such a one was to come from God, and not the Devil, what a force for good might he not be in this old world of ours."
-Bram Stoker, Dracula