Gday bassjunky,
My dad has had a few of those over the years and the best by far is the waeco's. He has 1 permantly in the back of his dualcab hilux ute. Runs it 24/7!! Comes home from work and plugs in the 240 and all day it runs off his car battery at work. Brilliant... Not a problem with them at all. I hired an Engel once for camping at fraser. It was a gas-12v-240v one. It sucked and all the food went off. (not saying that they arent much better these days) but that 1 was crap. So i personally dont like them...
But there is no such thing as cheap with those fridges . He is actually selling his waeco 80 litre fridge that is pretty much still new as he has 3 of them for $850 if your interested.
BD