The old cases are kinda crappy and crack easily. I have mine in a bomb proof box (thanks to link) and treat it like a new born baby, and i've still got stress cracks on the back. I'd say upgrade to the silver case regardless, from what I hear, they creak less and are more resistant to a flogging. I don't have one yet, but it's on my to do list.
GBA runs flawlessly too!