I read somewhere that bluetooth was a killer on 901. Not sure why. I don't use it except car phone and it's plugged in so I can't say. My battery life is some better. But not much. 3G all the time, rarely on wifi. Stock for now. Data and camera are much better. Also phone calls are me solid. I get a useable signal in places I couldn't before.
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I haven't had a problem with Bluetooth. I have WiFi off, but mainly because I don't have it at home. If I did it would be on.
Even so, with the extended battery, .901 and Juice Defender I can easily have 68% after 12 hours. That includes Live Wallpaper, 4G and the System app set to monitor.