So far, so good. The cooler just arrived, and the shipping was pretty fast. I set it up in the family room and put a thermometer inside to test for temperatures. I ran it overnight on wall outlet power and it maintained the 40 degrees I had set it at, and it also fully charged the battery. Next, I disconnected the wall power to see how it runs on the battery. It immediately switched to battery power. I let it run on battery power for over 24 hours. It continued to maintain the temperature setting, and after the 24 hours the battery was at around 40%.
Next, I need to test it in my 4Runner running off of the 12-volt car power. This is the primary reason I purchased this, is for road trips.
The only thing I was a little disconcerted about was the temperature readout on the unit fluctuated a bit more around my set temperature than I expected from reading the manual and online FAQs, going down to about 32 and then back up to around 40 where I had it set. The online FAQ indicated a ±2° cycle around the set point without indicating units (Celsius or Fahrenheit). I suspect their FAQ used Celsius which would explain why the fluctuations in Fahrenheit would be larger. In any case, I don't think this is a big deal; they just might want to clarify the temperature units in their online article on the topic.