Yeah, and I've just played it for the first time. I used the GH3 controller.
It ABSOLUTELY sucked ass. It throws all my songs about half a second out of sync, doesn't allow any offset in the sound options and has the worst sound effects ever. The fret boards look like they've been made in paint then stretched to fit, and everything just looks and feels dire.
As soon as this is given a new lick of paint and the technical issues are sorted out I'll love this. But for now it just plain sucks, I couldn't enjoy any of the songs I played.