From the performance of MiPow can keep his promises. A full charge of empty sucked IPhones hardly takes longer than the network, compared to the output of a PC USB port, it is almost twice as fast as promised. The well 100% extra energy I can confirm from practice. The remaining battery power appears on only two Lichtlein (full - 50% - end), which is advised but a bit too rough, recharge the empty battery takes good solid 3h with iPhone power adapter, PC about 5h.
Thanks to a USB port you are not fixated on Apple devices, but they are likely to constitute the main target group, who paid otherwise the integrated Lightning adapter with?
The battery has a sophisticated and well made, the attachment of the lid to the side on a (admittedly very robust) cable could also prove in the long run as a weak point, here should be something carefully handle the equipment and not constantly tear down the cover rudely ,
As a single negative point there is to be noted that the battery in many cases can not be connected via the Lightning connector, when the phone is in a bag or case. When UAG Case Urban Armor Gear IPH5-SLT used by me / BLK VP Protective Case for iPhone 5 (shock-resistant housing and protective screen) Blue Gray / Slate do not succeed. Will it work with the shell, this is either a) very thin (less than 1mm be something) or b) at the bottom have a 2,5x0,5cm and insert the rather thin must be (1-2mm) or c) the best bottom completely blank.
Otherwise, only an additional cable will help ...
A total of MiPow is nevertheless a successful accessories for those who are underserved by the battery of your iPhone on the road consistently. Kaupfempfehlung!