For myself an iPad (retina) and an iPhone 5 are simultaneously supplied with fresh power. This happens even faster than with the original Apple 12W power supply!
Also at the same time stressing the devices can not slow down the loading process are detected.
The only complaint on my part is the very bright blue LED light between the USB connectors, which lights up when the power supply is plugged.
In a dark room, this can be disturbing. I have the LED with me why pasted over with a piece of tape!
Despite the criticism of the power supply does what it should and that too very quickly.
Additionally convince me finish and quality, which is why I at ***** - be stars!