Bought these just for charging and they do a great job. Comfortable and snug fit on the charging ports, not easy to accidentally pull out, and the 90 degree port is great when I'm doing things on my phone and charging at the same time. The best thing about them is that they are very flexible and fairly thin, not thick and rigid like some of the other cables I have. This makes it very convenient to be on the go or charge while using devices without worrying about a hard cable getting in the way or causing discomfort. nice and fast and perfect for overnight charging. Definitely faster than the USB 1 cables I have, and when I plug it into my powerful wall adapter it charges slightly faster than a standard USB 2.1 charger, but not by much as far as I can tell. It's not like I'm sitting by my phone with a stopwatch, so I can't give exact numbers, but it helps. I haven't used them to transfer large amounts of data so I don't know if they are better or worse than they claim, but I connected a few devices to my computer and confirmed that the cables can transfer data. All in all a great buy for the price.