Well I'm pretty happy with JB2 FW for now... after 120 hrs of light usage (3g, 2g, wi-fi and gps most of the time turned off) I still have 60% of battery left.
I also do not have the notorious "no-sleep" issue ("Running = 1.5%", "Screen On = 1%").
But things could even be better if Samsung manages to develop a FW that wouldn't be so demanding while 3g/wi-fi is turned on. There are so many entries in radio log at that time which tells me that the phone practically isn't sleeping at all.
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