By enabling Google now, is it constantly sending your location/private information to Google without you knowing? Or does it send information only whenever you use it like with Apple's Siri? I am hesitant to use Google Now for this reason. It seems annoying if every hour even when your not using the phone, information is being sent to Google that may not only drain battery, but also just the fact that information is being sent to Google constantly may have some drain on battery life like it or not.