Those GAN chargers are *the* shit. I am using one right now. Its as small as a phone charger but charges my laptop faster then the one that was included. 

 I know the Apple chargers are shit compared to the fast charging stuff. 

 Its all about wattage, so Apple can get pretty good as well. But not in size per watt. Just a matter of time until they switch to GaN. 

 The charger I was using which seems to have died had 2 ports with 20w each but only one was IQ port which seemed to work MUCH faster than the other