Experience with Novum PMR Mk 2 bronze resonator?

Made in Germany by Highend Electronics, this item has had very good reviews going back a few years now. How would owners describe its virtues? Thanks!
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I wouldn't trust those reviews but I'm curious too...
Does it really work? Can you justify its cost ($2500 per piece)?
Or just another snake oil?
Can you actually use guitar cone resonators ($10 per piece) for that purpose?