All in all, it works great. Not very loud, especially on the "low energy" setting. There are some small things to be aware of:
1. The lid is not great.
I suspect some energy is lost through the lids' material and seal. There is a 15L version with a sleek flat lid and this 20L version feels like a bit of a mod both esthetically and in the choice of material. I do like the horizontal, low design though. Easier to fit in a small car than the taller models.
2. Sensitive to voltage drop at compressor startup.
Running the refrigerator from a battery pack, like an EcoFlow, with a regulated voltage/current 12.8V output makes the refrigerator go into low voltage lockout on compressor startup, even with the voltage protection set to the lowest setting. This repeats a few times and eventually it runs, but it is very sensitive to the voltage drop those regulated power banks cause. Half a second delay before the protection kicks in would have solved the problem because the running current is not a problem at all. So, I end up running the refrigerator off the AC output on my EcoFlow, which is a lot less efficient.