Dezz has demonstrated the cards on a recent retro computer party (Arok Party 2014, Hungary). People say it worked well enough and the image quality was great.
Dezz is working on some last little flaws. (It must be made sure the PCB don't need to be modified anymore in order to fix them.)
@jcarvalho: I was meant it was working, just it has some issues.
@Marmes: Dezz told he not at all expected the development was to be taking such a long time and he is verry sorry about it. There were stages when it looked like it's almost done and all is working well, only to learn there are still some bugs to be eliminated. (Some of them has been introduced by some well-meant design changes.) I can imagine these are driving Dezz slowly crazy. Let's hope it's all going well this time.