I've been using the free Juicy Defender for a few weeks now. I really dont know how much better the battery life is, but the lag is annoying. I used the stock settings that it finds for your device. My problem is that when I lock my phone (power button) and then bring it back out of lock mode, it is so slow until the phones screen powers back on to let me start things again. --the Juicy Defender icon on the notification bar will turn from a red dot to a green dot-- Anyone else have this issue?