I have one that I have used for a bunch of years. (Don't even remember when I got it) They work well for a 35 - 40* drop from ambient, so if it is in the 70s or low 80s they work really well. Above that, they are a good "pre-cooler" to then put your favorite beverages in the fridge without overloading it with warm stuff in hot weather.
True, ice works better, but over the years I bet I have paid for the electric cooler 20 or 30 times over, with saved ice $$$$. I'd buy another when this one konks out.
"If the women don't find you handsome, they should at least find you handy." - Red Green