It is said that the leaked update is stable and tested but there would be some bugs in it. The firmware update will wipe your data so keep a backup before installing the leaked firmware. And flashing a custom rom and the unofficial leaked firmware is not without risk. While some technical knowledge is recommended before doing that. This is not a official firmware update from Samsung, it is a leaked version of the Android 4.3 update for the Galaxy SIII. The leaked firmware will not void your warranty.
After installing the firmware the launcher remains the same but the User interface looks like what you will find on the Samsung Galaxy Note 3 and the Samsung Galaxy S IV.
Did you installed the leaked firmware? Let us know in the comments section below.
source: SamMobile