I have a Coleman cooler like this. I posted in that thread.
It's ok, but nothing great. It is good to keep stuff cooled down to about 40 degrees below ambient temperature.
It pulls enough current that if we stopped at a rest area, we had to unplug it so it wouldn't drain the battery. This current drawl makes it not usable for camping without hookups. Also, if it's in a vehicle, it puts out some heat, so the cabin gets warm.
There also isn't enough insulation in the sides to keep things cold for long after it's unplugged. Since there's openings inside to allow for air flow, you also can't fill it with ice.
Luckily it was given to me. I'd be upset if I had paid for it.