I really haven't had much issue with him, personally. I think the longest I had to wait for a mould was just around a year, which is only a little longer than anything reasonable. But I have watched as many folks wait 2, 3 or almost 4 years for their group buys to move. As dozens of buys started after the ones still open are completed without explanation. As Miha went from empty responses to requests for updates ("working on it...") to no responses at all. As he also started several buys that nobody asked for apparently just to avoid working on the ones he committed to years ago but now seemingly doesn't want to deal with.
It is my distinct impression he has no sense of responsibility for the projects, or consideration for those involved, or respect for his own promises, or sense of fairness in doing the buys in something close to the order they were accepted, or at least explaining why a buy that is 5 months old and has 30 takers gets priority over a buy that is 2.5 years old and has 80 takers.
It is true that I am not one of those who has been or is being badly screwed, but I have no interest in doing business with somebody like that.