Thought I'd give this thread a bump and post some very preliminary impressions since Mike so graciously suggested it.
For the interim I've had to slap another 1M run of these cheap, high-capacitance interconnects in the chain, so take everything I say with a grain of salt.
But I will say that I like the X-Feed's crossfeed effect. It subtly fills in the gaps between those clusters of sounds outside the ears and in the forehead resulting in a more realistic image. And when I say subtle I mean it. When I first put it in the loop and played a song with an intro of acoustic guitar playing soley in the left channel I had a hard time discerning a difference. Soon thereafter when the rest of the band joined in it became clear - the black holes that formerly resided by my temples were now part of the acoustic space of the performance.
Now I was never one to be classify myself among those that gets fatigued by headphone listeing, but I have felt the stress on occasion, and the weird imaging is oft-present. The X-Feed nearly clears this all up. I say nearly, as there's still that odd sensation of an instrument playing behind an ear on some albums, and if you find extreme stereo separation an uncomfortable thing, you may be left wanting for a higher degree of crossfeed, as the X-Feed isn't going to dramatically reduce it.
As for the effect it has tonally, there is no alteration of the frequency response whatsoever. There is, however a slight thickening of the sound, but it may very well be attributed to these interconnects I'm using. Some soundstage height and air is lost as a result, but again it could be the additional crummy cables and not the X-Feed's doing.
Overall I'm pleased with it and anxious to hear it do its thing in a more ideal configuration.
