I've bought a few sets from that guy a long while back, he's been selling them for years (along with bootleg versions of some of the La Musica CDR sets). They do include some rare music that is pretty much impossible to find elsewhere but I believe they're sourced from mp3s, plus packaging is pretty amateurish. They're sourced to a German label called Illegal Alien, though that only exists to put out these CDR sets on eBay, AFAIK. Frankly I'd steer clear, at $165 for 10 CDRs, especially when labels like Ignuitas & especially Univive are putting out quality Rallizes material on pressed CDs in excellent packaging (though yes, you will pay a lot for those).