What's interesting to me about this Coleman is that they call it the "Stirling Power Cooler".
A
Stirling Engine can be used for
referigeration. And can theoretically be very efficient without the need for a compressor refergerents, etc.
I'm not sure that the Coleman is really powered by a Stirling Engine, but if it is it could be cool.
Efficient, no refrigerents to leak, etc.
The Waeco units look like they are powered by a Danfoss compressor and the ARB/Engel units are powered by the Sawfuji Swing compressors.
If anyone has any details on the Coleman, I'd be interested.
But like I said, the think the ARB/Engels are tried and true.