Good battery to charge my Galaxy S3, also tested with LG G3. However, I was not able to charge my tablet Asus Transformer with the keyboard, but separated from his keyboard part it worked.
The design of the battery is very pleasant with its little pouch to add the cable which avoids to look for one at the time of recharge (regarding micro-USB). The battery level indicator is reminiscent me arc reactor Tony Stark (little dedication to "MARVEL"). I can not even tell if it consumes the battery (if it is the case this is not seen).
Autonomy is 1 week (approximately) by using it once a day or 6 Galaxy S3 loads.
3 USBs is a good choice, it is a sociable battery!