To me, this demo is serious uncanny valley territory.
When I was composing MOD music on my Amiga back in the late 80's, I was very much aware of the problem of playing the same instrument on the left and right channels at the same time, especially when doing pitch slides. You got all kinds of weird interference problems, or the audio version of moire effects, if you will. If you were good composer, it could be used to good effect in music in a lot of cases, but most of the time it was a real pain, especially with sound effects in games.
I hear plenty of that in this demo, and it's far different and more annoying than actual reverb. As it is, the sound is just too "off" for me to consider it an improvement, and just like 3D sound, I'd have this feature turned off.