It's a good PrC for Good vs Evil games and excellent for Good vs Undead. Paladin Spell access is always nice and gives the Arcane a much needed boon for healing various conditions and it adds a 3/day Crowd Control effect to your blasting spells. The catch is the entry since Turn Undead it typically requires a dip, Sacred Exorcist, or (if allowed) an expensive item. But you can at least piggyback off picking up Turn Undead for some of it's options.