The balls came out a little dry. (Don't you dare 'that's what she said' that. That's just nast.) I think next time I will be a bit more heavy with the sauce when cooking them or add an egg, but it still tasted fantastic nonetheless.
I got the ground beef from Grazin' Angus Acres at the Union Square Farmers Market. Their cattle is grass-fed and finished, and they are Animal Welfare Approved.