I believe that they do run at full speed. Most games run full speed, but there were a few games that didn't work for me. At the same time, I'm sure there is a newer version that plays more games now. GBA doesn't run well on PocketPcs so I was thinking of buying a psp to play those home brewed games of course On the Slim, I have not come across any bugs, slowdown whatsoever. Infact, with the way PSP fit comfortably in our hands, it plays much better thann the original GBA If the sound quality is good then I'm getting a psp, now I just have to figure out how to get past that pandora battery problem.