As I can't yet add a review the normal way
Mine is now set up with a linux dual boot and demnu, it works pretty damned well but there's clearly a long, long way to go before we have a viable linux firmware with an established set of conventions for game installations/file organization and so forth.
Out of the box, though, I'm absolutely stunned up the Dingoo A320s Gameboy Advance emulation. One of the videos in my review shows Advance Wars on the DS and Dingoo A320 simultaneously. It speaks for itself. That said, AW isn't a particularly intensive title.