The McCulloch looks very similar to it's Husqvarna counterpart. And since McCulloch is part of the Husqvarna company that makes sense. I've seen way more long term reviews from the Husqvarna auto mowers and most have been favorable so that's the way I'd go.
not only that, it's a 'haphazard' (if not truly random) cutting path, yes, it 'feels' very disorganized , but, it can operate unattended and even at night. Kinda irksome to think about how often it may be running over places it has just mowed! still, people who have successfully managed to set them up properly seemed pleased with them.