HATES anything Mundorf. I have not done any serious comparisons myself, but he has, and does not like them in either amps or speaker crossovers. He also hates Duelunds
please don’t take this opinion as gospel. I would suggest that the dealer is out of line with about 95% of the rest of audiophilia and may be pushing an agenda.
Duelunds are widely regarded as the best caps out there (no affiliation).
just one opinion as to where Mundorfs and Duelunds lie in the food chain: