I like this battery case in particular because it doesn't add too much extra bulk or weight to my iPhone. I was Leary about getting a battery pack at first because I've used some in the past that made the phone a brick. They've come along way design wise and I'm happy to say this is a keeper for me. Plus, it's easy to take on and off and provides an adequate amount of protection. It's an all around good case that keeps my iPhone looking sleek, won't wegh down my purse and keeps the phone charged through the day and then some. I'd buy again.