The 3g would slow down after a while after JB. And when I installed themes it would be slow from the get go. Backgrounder would crash ALOT so it was like not having it installed in the first place. I would enable pandora with background than surf the web, 3 minutes later pandora closed. With the 3gS all these problems do NOT exist! And it never slows down no matter what I install from cydia. I have a 22mb complete theme installed and the iPhone moves FAST! pandora and other streaming apps never crash even after long extended usage. This phone is a PLEASURE to use with a JB because it works as if apple wanted us to now use jailbreak apps, haha. If you been on the fence, DO IT, it's well worth it!!