Mophie's cell phone cases have a back-up battery built right into them, doubling your phone's battery life...a nice perk for the busy parent or traveler who is both busy on their phone and away from a charger during the day. But that's not the only reason I love my Mophie case.
I love the streamlined look and smooth finish...it's almost like not having a case at all. I've received many compliments on my phone's look and have answered the question "what kind of case is that" many times.
The last attribute of the Mophie case I consider a positive is it's weight. There is certainly an extra heft to the phone due to the extra battery. My husband says it would bother him to carry it around all day, but I believe I drop my phone much less often because of it.