Old technology isn't necessarily bad technology. If it works, it works. More efficient (and expensive) electric compressor units are great if you can afford them and you have the electricity to run them. If you need to run on propane then the absorbtion fridge is the way to go.
I rebuilt my fridge with an Amish cooling unit and it's been great. About half of my camping is without hookups so I need the ability to run the fridge off of propane (I don't have a multi-megawatt battery bank and solar system).