Well, the good news is, we have 5 companies currently integrating the Pro ISL output. These will have direct outputs that can be placed any distance from the MSB DAC. Perhaps this will also encourage more manufacturers to implement this technology across their products. The rising tide floats all boats etc. Regardless of "quality", all servers are still too noisy to be near analog signals. Pro USB with the DD is bordering on hat on a hat, but the extra isolation isn't a complete waste. More segmentation the better. We don't feel that it is necessary, but for those who already own one, no reason not to continue using it. We have also run the DD 10M from the DAC source, so your 7 meter run should not be a problem. The second communication cable is just for DAC setup and does not send audio. It is actually shut off during playback.
Keep us updated, I will be curious to hear your thoughts. I have the X Diamonds Mk II in my home system as well.
You are correct, no one needs 1 km of cabling, but what is really cool is how advanced and well engineered this technology is. We are just starting to unlock its potential. The new Cascade really starts to take advantage of that data highway as well. Cool stuff.