Recognized without problem my iPhone 5S, iPad not tried I do not have but that should not be a worry if it works on an iPhone.
Charging is regular and is just as effective as the original cable. Similarly for synchronization.
For length, although they bottom 1 meter each. This corresponds to the size of the cables provided by Apple.
I'm very happy and 20 the two, the price is quite correct. And it allows to leave one in the car or at work.