Saw this in the Zavvi sale and it looks like the lowest price around for a great game!
358/2 Days features a new gameplay mechanic known as the panel system which involves the customization of the character's levels, items, magic, weapons, abilities, armor and accessories. Magic in this game is mainly controlled by this system; certain spells cannot be used if their corresponding panels aren't equipped, but can be used consecutively if multiple are attached. Weapons are also equipped using panels, as well as abilities. There are also "Link Panels" with which multiple panels can be combined to form new, stronger abilities.