This is the answer I wrote today to somebody who was interested recently in using Hermes (I fixed the text a bit to make it clearer):
It’s nice to hear Hermes still has a relevance here and there, however, I didn’t touch it since Nov. 2006 and I don’t have any plans to get involved in [...]

This version managed to convert a couple of hundreds of sample articles from the arxiv-math.
Because those sources vary widely in terms of metadata quality (author, date…etc. records), some of the converted articles look a bit messy. That’s the next Hermes version’s job: to get a bit wiser in terms of recovering the metadata, and in [...]

This version managed to convert 160 out of the first 254 from a month of arxiv/math articles, a ratio of 0.63.
The articles drawing diagrams or pictures (e.g. using the xy package or similar) were not convertible by this version of Hermes, and I don’t plan on adding support for them anytime soon.
The rest is fixable [...]