Both charges and syncs data to an iPhone 5. The phone came up with this message when I used the cord to plug into a MacBook, but there was no issue syncing a song.
Customer service was impressive, and extremely helpful. After a month of using this, I can say that the cord is exactly what I was looking for. It's good quality, and my phone only displays the error message occasionally. This is fixed by unplugging the phone and plugging it back in.