Just got one of these this evening. This thing is damn impressive in terms of build quality and controls. The performance is up there with a pandora clocked at 600mhz which is plenty fine for GBA, SNES, NES, GB, SEGA systems. I haven't updated the firmware on it or really pushed it to it's limits, but so far... EXTREMELY impressed with this.
For whatever reason, dpad on these Chinese handhelds always got something wrong on them, like catchy, mushy not enough travel etc, I really can't complain with this at all, 2nd to the pandora or a official nintendo controller, it's really that good. ABXY and start/select are all good similar quality to dpad, L&R are clicky if you like that, not too stiff like I heard in another review. Dedicated up/down menu buttons and power switch are positive addition over other handhelds. 2 microSD card slots, and easily accessible internal are great features to have. Love the fact it uses a standard Nokia BL-5B 1000mah battery, you can pick replacements up on amazon/ebay for dirt cheap. One of the first handhelds from over there to include opendingux out of the box, no goofy menu system, and not actually include pirated ROMs, super impressed with that.
The bad things, the reach for L&R is a tiny weird, but not a show stopper. The lack of a 'chin' under the buttons is a little weird at first, but I'm already getting used to how to hold it in the hands. Volume wheel seems to have a extremely small tolerance for min/max but that might be a software problem. LED light at the top of the clear case bleed quite a bit but I guess that's to be expected with a clear case. Battery cover appears sort of loosely fit to cover the removeable battery, but it closes and doesn't pop out, could have been tighter is all. Device is mono speaker, would have liked stereo but for a mono speaker it's not too bad at all.
Overall for $60, I think you are getting your money's worth if you want something small to fit in your pocket to play older games.