I have a Qoob Pro modchip in my GC, and it works like a charm. I'm using the smaller DVDs for my games, and that's just fine. Only problem would be in finding them nowadays. I still have some, and I remember that you also had to have specific ones, as most of them didn't work. Can't remember which brand it was, but basically the brand didn't matter so much, it was more the media code.