I have a 70L one. Last week, the home fridge was playing up (stuff wasn't staying cold), so the wife put the stuff from the fridge into it, put some ice in, and i kid you not, when I got the milk out of it the next morning for coffee, the milk was icey.
Mine works a treat. Also, we used it for camping for 1 week last christmas. Very hot at Ballina, and the thing was inside in the heat of the camper. We put a block of ice in before we left home, food, broken up ice etc, and the block was about 1/4 left when we got home.
Cheers
Grant