This keyboard intrigues me too, especially the compact size, it might be worth its weight and cost as a MIDI controller.
However, I don't believe it's an arranger in the traditional sense (styles that follow the chords you play.) Instead the accompaniment is "loop based," whatever that means. I guess it's like a collection of multipads?
I would like to see someone doing a song cover on this thing, without the aid of a tablet or iPhone. I searched for a while on YouTube and didn't find anything. If anyone comes across a video like that, please post it!!