My 2p worth. My phone is UK Vodafone. Updated about a few days ago, OTA update failed but worked fine through KIES. So far, I am loving Jelly Bean. Got rid of Go launcher as the stock launcher is v. good and doesn't have the endless irrelevant updates that Go does. Particularly like the Smart Stay and the ability to have quick access icons on the lock screen. Feels like a new phone.
BTW, recently bought an Iphone 4s (for a development project) and it just confirmed for me that Samsung are much more innovative than Apple. The 4s seems very pedestrian by comparison.