I wrote my first product review! This one is on the Anbernic RG503 handheld emulation device.
Okay. Playing Nintendo DS games on this thing somehow freezes the system to the point that you have to reflash your OS. Though, you probably wouldn't want to play DS games on this device anyway because there is no touchscreen or anything that can practically be used in place of one.
Though Mario Kart DS worked fine. Super Mario 64 DS was the one that hanged. The game requires you to touch the touch screen to start, so I had to quit, but exiting froze the thing. Hard resetting corrupted the OS.
This may not be a problem on other operating systems like JelOS.