After going through a bad experience with trying to buy and then (in some cases) buying first a Vector, then a RubberMaid, then a Wagan Tech, and now a Koolatron, I can tell you that it's a relief to find a well-designed, well-built DC-powered cooler/warmer that actually works! Our Canadian neighbors to the north have done a great job with this unit.
I worried about its 17" height and depth, but once it was decided that it was going to live behind the passenger's front seat, those concerns became non-issues. In fact, its height is a benefit as long as it doesn't interfere with the seat back when you lift the lid, as you can reach right in from the driver's seat and get a can or a sandwich without much effort if you pack it well.
I also worried about all the ads that portrayed it as being only a cooler. But after having so much trouble with other companies' cooler/warmers, I decided to forget warming and bought the Koolatron without it (or so I thought). So when the unit arrived--in its original box, no less--I was pleased and surprised to see that it warms too! Excellent combination, since I have consumer-issue MRE's that I can now warm in it while I use my clumsier (and larger) Igloo Cool-Mate unit to cool other things down. And when I'm not doing that (like when the world ends or Limerick blows up), I can use it in the car as a cooler as I originally planned--an ideal situation.
If you need cooling in the car--or in an emergency situation (such as a power outage)--for medicines or for food, don't hesitate to buy this unit. In my opinion, it's by far the best one out there for its size and price, and I've seen or tried almost all of them.