Probably not many people here tossed them out.
I wonder how many have failed, other than HD failures. Three out four of my MKII's still work.
I only have one, and it's pretty flaky. I have the volume knob issue, and hard-drive problems (or the header issue), and I think I've lost one or more of the output channels again.
But otherwise, it keeps chugging along. One of these days, I'll pull it out of the dash, and try to figure it out. But it's such a low priority...