Official 4.1.1 update?

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http://forum.xda-developers.com – Hello guyz, I convinced my brother to move from his iPhone to the galaxy S3.. So he bought a S3.. And now he loves it...he hates iPhone now... After using android he said that " I was living under a rock all these time " .....and he is so so in love with his S3.. He even told he he is going to buy the S4 next... Now going on topic.. He wants to update his phone to latest version. Which I think is 4.1.1 officially.. My question is how is the performance or usability in jelly bean? What are the pros and cons? (If any ) If u want to mention any firmware build (HowTos)