So this is my second full work day with the 3GS. I still have 54% battery life after being at work all day, making phone calls, having BT and WiFi radios and 3G on! I am also connected to the BT in the car when I am driving. I can still go home and play a game or two, surf the net or tweet. On my 3G I used to come home from a day out at the office with all the radios on and be at 20% or less. Wow, I must say that this is a feature worth having for me for sure; this in itself will be the ROI for me and make the money well spent.