I just had a slight issue with this cable. The DIN is not grounded but I did not really think this would be a problem since each wire in the cable has its own ground and I had not had an issue till now, but apparently in some situations it may.
I was trying to use a cheap universal power supply with a Duo I just recapped and with this cable there was noise in the picture. With the cheap AC power supply, the picture was fine through the scart cable I made and the original AV cable. Also, with an original power supply and a different brand universal power supply, the cable linked in the OP of this thread worked fine. I had not tried it with anything but an original power supply up to this point and I could not tell any difference in the picture quality. I think mostly the issue is with the power supply, but there is that difference of the DIN not being grounded that is the only thing I can think of that would cause one to work fine and not the other. I had also tried previously on a supergrafx and coregrafx using a cheap Chinese supply and the cable worked fine with no noise.
Sorry if anyone has bought this cable and has issues with it. I think in most situations it will work fine, but just wanted to let everyone know there is a potential of noise if using a cheap power supply.