Zidoo Realtek 1619 based models are much discussed here:
http://forum.zidoo.tv/index.php?foru...rtd-1619dr.54/
And for the Dune, however not about the Max Vision 4K but its little brother Pro Vision 4K Solo, I'd keep track on this thread:
https://www.avsforum.com/threads/dun...-solo.3180599/
Both forums enjoy the presence of knowledgable members.