Jelly Bean on S3 sounds great, but there are a few bugs which may ruin your mood to port JB rom to S3. WiFi, bluetooth, NFC, Camera, Audio, storage and more. Well, being an S3 user I won’t do it as I regularly connect my phone to Wifi and I love snapping photos.
FYI, this is Galaxy Nexus’s Jelly bean ROM ported to SGS3. So, If you just want to have a look of how Jelly Bean looks on your S3, you can proceed to install. Via