I have purchased two photogravure prints and I'm well pleased with them. I have seen the silver prints and can find no fault with them. I understand that they are made on Ilford Multigrade IV paper and archivally processed.
I recall seeing Brooks Jensens original proposal for this series of prints when I was visiting Chip Forelli in New York a few years ago and I think he was making digital scans of original prints and having a film writer produce a traditional black and white negative from which the final print is made. I have no problem with that approach and have not purchased a print because I have not yet seen an image that I really want in my collection.