Default Samsung Charge on the Juice not Good.

I have been selling and setting up the Samsung Charge at my store. I really like the phone and the speeds are even good on 3G. One issued I noticed is if you download and run an App called Juice Defender to save battery life it will shut of your 3G 4G and leave you on 1X only. I use this app on my X and it gives me about 3 more hours of use a day. Been a great app on X and Droid 2, just not so good on Charge until developer updates app.