Not the exact unit, but I have a similar unit from Koolatron.
Not only did it not cool evenly or low enough, it sucked extremely high amounts of power. As a test one day, I hooked it up to a deep cycle battery that is usually used to power a small 35lb thrust Minnkota trolling motor. With that battery, we could troll small boat all day (12 - 14 hours) - solid battery. With the Koolatron attached, it went less then 24 hours on a full charge.
It's to the point where if you leave it running overnight while attached to a standard car starting battery, you are at risk of not being able to start the vehicle the next morning.
Since I bought an ARB/Engel, it hasn't left the basement.
Pete