Please stress-test and feel free to submit problem cases as issues to the github repo [0].
"Aggressive mode", which leverages Chromium's "simplify page" mode, might do some of what you want, but typically you need some of the funky print css classes to enforce widows/orphans.
The main reason we have built this however is that wkhtmltopdf just crashes all the time. Other commenters seem to agree. We'd love feedback on whether Athena works in cases that other tools fail, as well as on quality of conversion.