Useful but limited

The product is well finished and robust, practical, I use it with an iPhone 4 and GS2.
You can put the USB cord from the telephone manufacturer for the load and that of the iphone fits comfortably while that Samsung managed very badly.
For against, the capacity seems very below as indicated. Or it is aging very fast.
After 2 months of use, I only happens with the 1.5 load some-charged battery or the phone bottom.
This loss of 50% of capacity in weeks drives me to buy another charger.
My advice: choose a higher capacity, better brand, or other technology (Li-ion?).