I wanted to use this to extend from a 30-pin portable charger while it's being charged. I've tried it with an original Apple 30-pin to lighting adapter cable, which worked perfectly, but not with this extension cable. It works with USB ports but it doesn't work with the portable charged. I have no use for it, but it works if you are looking to extend a connection from a regular USB port.
Did not do the job I expected and was quite flimsy. It started to come apart straight away. I wanted to use it as an extension from a Bose dock. It fitted but it does not charge ipod or allow any data to be sent. waste of money for me.