Farmed enough tit to make Quelaag's Furysword. I wanted to replace my +4 lightening spear w/a new, more powerful weapon. After all my work, I'm not impressed. It doesn't hit for a lot of damage, making shit like Capra demons a bitch (and those fuckers will mess you up if you're careless). I understand that you have to have humanity to jack it up. This seems like more inconvenience than it's worth.
I might return to the spear. It hits for 150-350 for normal to high strikes, and it does 900 if I parry-riposte - that's serious hurt. I also love that it keeps the enemy at a distance. After using it for so long, I'm addicted to its range. The Furysword (and any sword, for that matter) means I have to get in close. This is dangerous when facing hard-core bruisers.
Live and learn.