Finemet Fm series of line output transformers

Anybody has an experience with those transformers? . I understand that finemet is a kind of amorphous core material . I have to admit that Lundahl LL 1674 Amorphus input trans for some reason is not my cup of tea so I wonder if finemet Noguchi transformers have the same traits i.e detailed and airy but kind of missing weight in midrange and bass .