Got mine today, thanks for mentioning it in the first place.
It's an excellent form factor, and the gba and nes emulation is good although the screen refresh is a little slow. Main issue I'm finding (although I've only played with it for ten minutes) is that the buttons and dpad don't raise much out the body. On top of this, the plastic around the buttons is recessed, so it's difficult to press a and b at the same time, for instance. I would much prefer it with different, more raised buttons, but it's still got a lovely form factor and seems to play snes, gba, nes, mgeadrive and cps1 out of the box.