Aside from its godly stability, it's clearly the best looking shield in the game, I use it with True Greatsword of Artorias, now if only there was Artorias armor set, I'm sure that would be on a whole new level of epic.
I actually prefer the +15 hallow soldier shield. Its 85 (86?) stability and comes without the weight of the greatshields. Thats just for blocking though. i also use the other shields for respective elemental defense.