Yeah, the ability isn't all that powerful but a quickened stoneskin, lesser spell breach or fireball can be nice, especially since the BS needs to melee and not waste too much time on spells mid-combat.
EDIT: The duskblade basically already has a more powerful version of this ability.
I do admit that the absence of SoC bothers me more for fluff reasons than gameplay ones. A bladesinger just doesn't feel like a bladesinger without all his "songs".
In any case thanks for the reply.