I have the earlier model of this device and it is fantastic. I never go on a long trip or to a conference without taking it with me. There have been so many times my battery has been dying on my phone and this thing has saved my butt. I don't think there should be anyone that doesn't have a battery back up like this or something similar. I actually talked my dad into buying one a couple of months ago because he was worried about their power going out and not being able to use his cell phone.