Initially, I was a little disappointed by the refills (120% instead of 200% as I expected having made scientific calculations). But it was me who made a mistake.
Since I had expert advice friends, I understood better: all batteries are subject to a given capacitée (3000 mAh here). However, be aware that the battery also needs current to "feed itself" and fill its role. So it is normal that we can not have 2 whole refills. In particular, the current used to check the load, not to surge, etc, etc ... So it's very much like working, and better recharge a smaller but good quality, as poor charging.
MOST:
robust, sturdy, attractive, attaches to a pocket with his catchphrase, small batonnet that can be taken anywhere, convenient (no need to turn on or off), has a very strong beautiful lamp that lights at least 15m, white (not to look into the eyes, it is painful for it is fierce), quality aluminum, the size (10cm long to 2.2 cm in diameter), the included cable to charge batonnet (can connect to the charger of the iPhone for example, need to have a dedicated charger - or even simpler to a computer but provide a longer charging time), lamp with possibility to adjust the light intensity (strong or weaker or still blinking), attractive price
LEAST:
the clip that holds the not well batonnet which, if put to the waist, can slide (it should be a little closer)
No cable between batonnet iPhone (you must remember to take your own), but the price can integrate an iPhone cable is expensive.
No charge level indicator
CONCLUSION: great product if you want to recharge your iPhone.
For the price, I think we can be very happy and we must not hesitate.
EDIT 23/03/2015: For nearly eight months that I use the product, always very satisfied !!