Juice Defender, Batter Saver, Does it Really work?

JD works very well for me.  I keep the Wifi and mobile on and it turns each off when necessary.  I agree with everyone else.  If you don't have the settings correct, it will not work properly.  I'm averaging about 30-36 hours, with normal texting, calls and using tweetdeck.

False. 

Go ahead and have a bad signal for a few seconds, let it fail to communicate long enough for it to drop your data and you get booted from wifi or the files you were DLing on 3g fail.

Its a headache and not worth it.  Tried all the most popular, gauged my battery life religiously for months, saw no worthwhile difference.  Use it if it makes you feel better, or if it works with the way you use your phone.

As someone else stated, this app works if you leave your phone alone in sleep mode. For me (someone who is constantly playing with their phone) it doesnt really do squat.     In my expierience anyway

Ive gone through all the settings, set it up the same way you (Khassy) did. No luck! Quit telling me it works when it doesnt.

What makes it worthwhile for me is how I have it set to automatically turn off all data at night - I have mine set to shut off from 1 to 7 am. Love knowing if I can't or forget to plug in at night,  that I will still have the juice to wake me up, check emails and make a call first thing in the morning.

Also at work my Thunderbolt will go untouched for hours at mine time and jd helps you bit there as well.  Don't have the wifi location thing working just right yet, however.
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Juice defender only really works for those who have a normal to moderate usage pattern. If you use your phone constantly for web surfing games and other stuff, JD won't do anything for you but be a hassle.  Meaning that not everyone will get the same results from it.