I have a pretty good 12v/120v one that I use for my work that will go all the way to freeze. The biggest drawbacks is that they do not cool the contents nearly as rapidly as ice and takes a while to get up to a consistent temp. I actually still end up using coolers if it is just a day trip, otherwise I have to throw all of the drinks into the fridge so they start cold and plug in the cooler the night before to cool it down. Usually more of a hassle than just grabbing a bag of ice in the morning. Found it to really to be less convenient than a cooler unless I need to keep the contents cold for longer than a day or heading on a road trip.
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