Agree. The only 12v to USB adapters I’ve found that could keep my phone at 100% charge on long car trips (7 - 9 hours), with the display on the entire time while running Google Maps, a podcast player Bluetoothing audio to my car’s receiver, and Glympse running the background to let the people I’m visiting know where I am, are the Samsung chargers. A good deal of the trips are through areas with sparse cell and data connections, so the phone has to really ramp up power consumption to pull in the signals.
The first one I bought, for my Galaxy S3, was this one, and it’s the one I still use most of the time. But when I upgraded to the Galaxy S6, I also got another Samsung, with Adaptive Fast Charging, It can charge a flat phone to 85% in about 30 minutes (if it’s a phone that AFC capable).
