I'll admit this was a short demo on my part, but the truth is I could tell that the Douglas cables were staying. On loan I have a pair of Silnote Morpheous Reference and another pair of Grover Sx or 5x.
Build quality easily goes to Douglas. They have more heft and the furez locking connectors are far and away better than the clamping designs on the other two. The silnotes are second in that respect, but I almost broke a sweat getting them to wrap around my preamp inputs.
The silnotes are nice. They offer great detail that gave me low volume performance like I haven't had in my rig before. It was just as detailed and to ally correct regardless of the volume dial. I'd highly recommend this route if low volume is your preferred presentation. My only complaint is that it felt like the soundstage lost its depth - nothing felt recessed or forward. It was all on the same plane in space.
The Grover's were also detailed and added a bit more weight to the music. However, they are my least favorite of the three. Their sound has depth, but it also introduces a fatiguing element that I did not care for. I imagine on a treble-shy system these would be a good option to consider. Like the silnotes, they offered greater detail than the Douglas while maintaining a feeling of space.
The Douglas are my reference cables now for a reason - they are very well balanced cables. They don't scream out perfection in any one category (outside of tonality), but they don't do anything wrong. These are the most musical and holographic of the bunch, but separation isn't as strong as the other two. Just like the Pioneer bdp-51fd that took so long for me to replace, I think I'm going to have to spend quite a bit of dough to better them in my system. They also share the same feelings I had with the pioneer - I wish they just had higher resolution and detail, but every one I hear that offers that gives up the musicality as well. I'm just not willing to sacrifice musicality for a bit more detail.