I have used this charger primarily for my Nexus devices and they have been performing well so far. I charge Nexus 4 and Nexus 7 using this charger when I am traveling or there is no power outlet available. According to my approximate estimates, this charger charges Nexus 4 completely (starting with no charge left) within 2 hours 45 minutes and there will still be almost half the charge left in the charger's battery pack. It charges Nexus 7 up to 83% (starting with no charge left) within 7 hours. So far so good and I intend to keep using New Trent products in future.