I have the Wicked Chili Pro Series PSU - get USB adapters Testbericht.reviews for testing provided - Ultra Slim. Compared to my original Samsung PSU my phone (which also 1A and 5 volts) is no difference detected. My cell phone battery is charged at the same time as the original power adapter. The power supply is not warmer than the originals. Visually no difference to the original Samsung PSU is determined.