I, for one, really appreciate them for what they are. They are my only diesels, and I love them. At one time I had three that I got from Ridge Road’s close out at $50 each. I foolishly sold one to Ralph Berg, who sold it a short time later. If you can find one NIB nowadays they are going for $2-300.
I’ve collected extra parts over the years from folks that bought them for the trucks. M-11 used to be red, but I didn’t repaint it. Did a full body swap! M-10’s black and silver chassis was a replacement for one I broke in two going over a cliff on the indoor.