Works exactly as advertised, both the ports have full power efficiency in fast charging. Most of the device I've used before had one charging port with high power but the other very low.
When I bought the device first, it had some glitches, I guess it happens sometimes even with the best. But after contacting customer care, the problem was resolved immediately. Now I have a great time charging my devices. Best customer service!
My Samsung edge has compatibility issues with non-factory chargers and USB cables, but after trying out this charger, it works like a charm. My device gets fully charged within a short period of time and doesn't overheat.