Well, for drummers or singers it can definitely serve as a teaching tool. I mean, I'm not even sure there's ANYTHING that can serve as good of a harmony teaching tool as the harmony trainer that uses a synthesizer to demonstrate the selected harmony part. And while you won't learn how to use a full kit, you learn enough drum patterns and rhythms to get the fundamentals down.
I think they're getting people to make video guitar lessons for their website, and I'm sure they have people regularly thinking of a way to make the guitar more realistic. They'll probably get a real guitar to plug in and play the notes before they could improve the plastic one. Even then, though, it'd be sort of limiting. It can measure pitch, but it can't measure where your fingers are.
