The only issue I have found is that all the apps you get from imstallous after the jailbreak wont sync with iTunes. So everytime you sync your phone, you will have to download or install them again. If you select don't delete after install option in installous. You will only have to install them again. It's a pain if you ask me, so I wouldn't jailbreak it again if your phone is working ok. All themes still stay the same though. But my phone had a habit of turning off randomly with the older firmwAre. But with new jailbreak I haven't had any issues