Picked up a Modcon C1 (basically same as C3) start of March. It's everything I wanted. Got two kids 12 and 10 and they fit comfortably on the bunks. I think build quality has been outstanding. I have been on a Modcon owners facebook site for a year looking (dreaming) at it and the biggest issue that has come up has maybe some issues with leaking shocks. Unfortunately only trip I have done is home from Brisbane with it but it was so easy to setup and then pack up and get going in the morning.
Had some friends do a Kimberly trip in an MDC XT12HR and they had no problems and really enjoyed it. Not sure if the size of these campers is suited to a round Australia trip. It is perfect for weekend and bush camping, well at least I think it will be if I am ever allowed to go camping again.
One thing I didn't like with all of the Hybrid caravans I looked at was the Annex setup. The 270 deg on the Modcon would have been alright and I didn't like the caravan style Annexes on most others. I decided to get the van without and do my own. We always loved being under a big tarp with the old soft floor camp trailer. So I made a custom setup. Bracket along the roof, 4wd awning for quick setup overnight on side of bracket for short stop and a custom made L shape tarp from Pickers for longer stays.
Managed to set it up on the weekend, here is some pics