i own a 80ltr Engel Combi aswell as a 40 ltr Engel and a Autofridge 75ltr Eutectic. i reckon if i had my time again i'd own another Autofridge instead of the big Engel, the power consumption difference is massive between the 2 fridges, especially if your trying to keep food frozen in the freezer section of the 80ltr Engel.
no complaints about how well the big Engel runs, it's been running pretty much everyday in the back of the fourby since we bought it back in 2006, but you really need to keep an eye on the battery voltage if your not driving around each day.