My Roland SPD-SX has finally begun to malfunction after 8 years of beatings. Upon shopping around for a new one, I came across the SPD-SX Pro, which costs about $500 more. It seems like it is a lot better, but perhaps it is simply marketing hype. I was perfectly happy with the plain ol’ SPD-SX, but I’m hoping someone in this group has experience with both versions and can shed light on whether the Pro is worth the extra money.