Looks like there's a kind of HRTF behind this, right (plus other filters...) ?
Only listened to one example yet (download is slow...). Overall, the soundstage is wider/farther away, with more distance between the accompanying instruments and the singer. Sound is still sharp, balanced and detailed, though, contrarily to a certain number of HRTFs that tend to "soften" the details and emphasize some frequencies.
It's very interesting for sure. Could be great as a real-time plug-in for popular players, or (more geenrally) as a VST for instance. Having to re-encode the whole libray is burdensome, and the filtered files can't be used for archiving...