I bought the C20 from Amazon for $239. It's not large, but it's big enough for me when I'm out by myself. It's also large enough for a water bottle to stand up inside. The smaller one isn't. It weighs about 1/3 of my Basecamp 43qt.
The problem with it was the location of the temperature sensor for the thermostat. It was causing the compressor to cycle off after a minute or two of running, and the temperature inside the cooler wouldn't drop.
The sensor was slid down a tube in the insulation, about 1/2 inch from the evaporator line around the top of the cooler. My modification was to install a brass tube in the bottom third of the cooler approximately 4.5 inches from the evaporator line and relocate the sensor to the new tube. That solved the short cycle problem and the interior temps would drop like they should.