My research in September 2014 showed that the ironman 42 litre fridge was made by Companion, it was on sale for $595.At the time Aldi were the same thing rebranded Stirling for $450. I ended up buying exactly the same thing, rebranded Cenco, off ebay.
I got it for $370 buy it now delivered to my door in 2 days. I looked at the user manual for all three - they were identical. I've used it at our annual beach holiday where this fridge ran at 3 degrees on 240v non stop from 26/12 until 12/01. I took it to the Deni ute muster a couple of days after I got it and it worked flawlessly on 12v. So far it's a bloody good fridge for the dough.
The ebay seller has the same thing in 50 litre, and also sells the covers, which I think aren't necessary. They have a Danfoss (now Secop) compressor, 3 levels of battery protection, high and low power settings, and you can switch the display between Celsius and Fahrenheit.
Hope this helps. Genuine info, no affiliation.