It's not that different, at the moment. The only real difference is that we're pre-computing the HTML so it's faster (ArXiv Vanity runs at request time).
We've talked a lot with the ArXiv Vanity team. If all goes well and our users love the feature, we have an opportunity to support (and contribute to) to their efforts at improving Engrafo and LaTeXML and maintain the front-end facing portion of the system. That way they don't have to worry about hosting / providing a functioning front-end, which we're happy to foot the bill for (and maintain)!
We've talked a lot with the ArXiv Vanity team. If all goes well and our users love the feature, we have an opportunity to support (and contribute to) to their efforts at improving Engrafo and LaTeXML and maintain the front-end facing portion of the system. That way they don't have to worry about hosting / providing a functioning front-end, which we're happy to foot the bill for (and maintain)!