the accessories DO fit (at least the official ones) however owing to bad design they are inconvienent to use.
the gba link cable wipes out the headphone/power socket so gba link games can only be risked with a full battery, the e-card reader sticks into your hands a little and some gba flashcards as well as gameboy games tend to leave grooves (especialy the rumble cards) the unit when open looks like a snapped in half gameboy colo(u)r, the buttons are tiny and seem designed for young children, those with bigger hands will find they keep catching the screen part rather than the tiny l&r buttons
that said it'll still sell by the bucketload.