I bought this case for my mother's phone so that 1: it would protect her phone, and 2 so she wouldn't run out of power during her day of playing games (LOL).  It charges quickly. It uses the same cable as her phone (vs a micro cable that other battery cases use) so she doesn't need to carry another cable with her.  It is also relatively sturdy.  She has succeeded in breaking the bits of plastic around the buttons though, but this does not affect the phone or its ability to keep her phone unbroken.  She loves the case.  It also doesn't add any real weight to the phone.  I like that it has a built in additional USB outlet in case you need to charge something else.