I'm not fond of the paint splatters on the "ultimate Duo", but otherwise it is quite nice, being able to play US and JP cards as well as being modded for RGB. But is it perfect RGB or is it the ol' standard "vertical lines" RGB? Also can it play SuperGarfx cards? It needs to. That question is probably already answered, so I'll go read up more on this.
EDIT: I can't read that since I don't speak French.