Product review (4 stars): Love it for 1+ hour drives and still have cool food.
Works like it says it does.  Can get really cold.  Quieter than my home fridge.  Only reason i didn't give it five stars is because it is a little heavy even when empty (Although it does have a wire basket that you can remove most of the things inside without lifting the whole fridge.)  And it being a little pricey.  But other than that it works great!