I just got me an EZ-Flash 256mbit kit two weeks ago. And I must say that it works excellent. Every game works on it (except the save issue with USA pokemon games). The software you get with it is the best out and is very easy to use (saveing type and all that stuff is done by the program).
All I can say is BUY IT
. Anyway don't get the cheap XG-Flash rippoff since many people have trouble with the NOT recharable battery (EZ-Flash has a recharable battery) and so loosing the save games.
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http://www.ezflash.com.cn]