OK ... I know this is old but I have been having this same conversation with some of my dealers.

Two years ago (the age of this thread) I was selling DIN filler hoses on compressors two to one over the yoke filler. Last hear it turned around the other way. I started selling tank valves last year and have not sold one DIN only valve but a TON of the cheap yoke/DIN convertibles.

Does that mean that DIN isn't as popular as it once was? Probably not. I think that , in at least in the case of the valves, cheap is the winner ... no matter what the configuration.