Super Grafx

Are the Super Grafx system games (five I think) playable on any other Pc Engine system? Turbo Duo?

Does anyone have it, and is it worth it? Do the few games really look different from other PC Engine games?
Supergrafx was in essence a suped up TG16. It was a fairly good system tho it never had the run that it deserved. Supergrafx games are only playable on the supergrafx console though, but it is backwards compatible with TG16 HuCards. I'd suggest picking one up. They are hard to find anyways.