Yeah, PowerGig can't compete with RB3 if they're basically doing the exact same thing. Maybe if you really like Eric Clapton or Kid Rock, you'd buy their game... but that seems like madness.
And yeah, that's the only YT video that I could find. The link above it should have the full thing.
I think if they announced that they would be patching old songs to work with "Pro" mode, I'd run out and buy the guitar. There are probably some songs from RB1/2 that have piano parts that could be patched as well.