The GO20 is a quick cooling machine, which can drop the temp of an empty unit to 0 and 37 deg F, Freezer/Fridge from 70 degrees in 45 minutes or less. It is light enough to move around easily. Bought a 268 Wh battery to power it and the battery will run for 4.5 hours using only 60% of its capacity (of course depends on ambient temp and opening lid and how many warm items you add...). I would strongly recommend a battery, that way if you are stopping and shopping with the car off, then temp will remain constant. Besides, when car is running you can charge the battery at the same time as using the unit. (may depend on battery model).
It does not seem to stay cold for very long, so I am not sure about the insulation value, but when plugged in, it will run like a champ.
I would but it again.
Still trying to figure out if it is large enough for all of our needs.