Honestly, I'd probably rather get a device that I could run more than just one system off.
Compatibility is somewhat sketchy, by the review. I can get just about the same level of performance off a PSP-based Genesis emulator, though the buttons won't be QUITE right, and it'll do NES, some SNES, etc just fine.
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Try checking the MAME manual at http://docs.mamedev.org
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