I bought five of the last 188-in-1 models back in May or so and was going to sell two of them to Kitsch and another forum member until they found out about TaoBao and the manufacturer, Gang Feng Industries, throught a YouTube user. The other units went on eBay.
Those were cool if you wanted to play Mario Land, Contra, Batte City, Tennis and some other battery-less DMG games but there's no difference in hardware whatsoever apart of the built-in ROM.
If you're going to play single player games on this thing Kitsch's unit is what you're looking for; he also carries more colours than the TaoBao distributor so...