I can't play this game with anything else than the fast-roll anymore so I'll gladly cast away that huge shield in favor of mobility. I have a lot of fun with this build, not only because I'm fond of Artorias, but it's surprisingly viable with a bit of practice and experience. If used in PvP never use the two handed strong attack unless your opponent is immobile or trapped.
Killing Manus with this build feels pretty good. Killing Sif with it...does not.