Have you ever found yourself thinking "I'd love to charge my laptop/tablet/other high power USB-C PD device in the car efficiently and without using a bulky inverter?"
Well, that's exactly the problem the PWR+ solves. In my testing it's extremely efficient (64 watts from the battery to charge my 61 watt MacBook Pro). It also happily charges my Surface Pro X and iPad Pro quickly. If you have a USB-C capable device that charges at a high wattage, this sucker is cheap ($50) and seems to work quite well. The only "complaint" I have is the cord is really long.