i'm going to say down, as most spurs (even rowels) are meant to be worn down. The pics that were posted, while the base curves up, the rowel part actually curves down. I had a trainer growing up that made me flip my spurs over so they were pointing up on a particularly slow horse. It gives your spur a completely different feel to the horse, one that's much more severe. The only time i'd recommend someone to wear a spur that curved up (like a swan neck) would be a long legged rider who's heel hung below their horse's barrel so they won't have to move their leg so much.