Ordered to avoid having to carry round the official Nintendo charger with UK plug (and doesn't work against 110V). Charges my 3DS XL from a 1A USB power charger or from a laptop USB port.
Has trouble charging the 3DS XL when it's on and wifi is running, but I think that's just the limit of current over USB and not a fault with the cable. Obviously charges most quickly when everything is off.
Build quality seems good and what you'd expect - cable is thick enough without being awkward and can fold down easily to fit in the pocket in the lid of the official 3DS XL case.
Came in a sealed bag inside a jiffy bag through the post: not in the box shown. However, I don't care about that.