Updated through Kies... Its quite a nice update, as I've got Google Now with it. The OS feel is smooth, and works well. However, be prepared for a quicker battery drain, as the Jellybean uses it to the hilt.. expect a drop in the battery life by a few minutes.

I can't get the multitasking feature(which I have now come to believe that its only for the Note)

There's the Block mode which is added, which seems to be well thought of.

I'm still tinkering with it.. Hope to give more substantial feedback.

Cheers!