Mine just busted. Double strum on the downstroke, upstroke works fine. I'm lugging all thsi shit over to a friend's house this evening, and I suppose the whole thing will go before the night is over. With the holidays, I probably won't even see that box until next week. I think I'm just going to buy a GHII or III controller and just sell the replacement (even though I like it better than the GH controllers). What shoddy worksmanship.
EDIT: That way I can play GH co-op or versus, too.