I've got RE:UC, which I picked up as a good co-op game for the Wii. I've always been a big fan of the light-gun style games at arcades, and to finally have a good full-on co-op game is a big plus. Anyways, I'm curious about the use of the Wii Zapper and this game. I don't have the Zapper, and I'm wondering if it's a worthwhile investment to pick up a pair of them. If anyone wants to toss a short review or ballpark a 1-10 with and without the Zapper, it'd be appreciated.