I bought this for my 15 year old daughter who is taking a school trip to Mexico next month thinking it will probably come in handy since the battery on her 5C is doing good if it lasts for 8 hours.  It arrived quickly and I was definitely impressed with the build quality for the price. Her phone fit nice and snug and there was a positive click when it reached the plug on the bottom of the case. The top part of the case was a perfect fit as well and it snaps shut with a very firm grip on the phone, but it does seem like it will be a bit of a struggle to remove it.  For those that will leave it on their phone all of the time this is a moot point of course.  She plans on testing it this weekend to see how long the battery will last and trust me, she is a very heavy user. The 4200 mAh rating seems to be a bit of a stretch and in theory it should last almost 3 times longer the phone battery which I believe is rated at 1,507mAh.  I will update this review when I hear back from her and then again after her trip.  Oh yeah...she loves the shade of pink I got her.